Note: Descriptions are shown in the official language in which they were submitted.
CA 022~394 1998-12-22
READY-TO-ASSEMBLE, READY-TO-EAT PACKAGED PIZZA
Description
This application is a division of co-pending Canadian
Application Serial No. 2,189,506, filed November 4, 1996.
FIELD OF THE INVENTION
The invention relates to a pizza food product and a kit
for assembling same. In particular, the invention relates to
a fully baked pizza crust, storable at refrigeration and room
temperatures, which crust has satisfactory texture and
palatability when served either cold or heated. The invention
further relates to a kit for assembling a ready-to-eat pizza,
which kit contains said fully baked pizza crust and other
components necessary to assemble a ready-to-eat pizza.
BACKGROUND OF THE INVENTION
Food products which re~uire a m;n;m~lm amount of consumer
preparation and are quick to prepare are common items on
grocery store shelves and in refrigerator or freezer cases.
Examples range from cheese and cracker snacks and canned stews
to refrigerated bagels and some frozen dinners. Typically,
such products will be eaten as packaged or after a brief
heating period, preferably by microwave heating. Notably
absent from this category are pizza products having a fully
baked or a partially baked pizza crust.
Pizza products, while widely available frozen, are
generally not as widely available as a refrigerated product.
Refrigerated pizza products tend to be manufactured and
distributed in a relatively small locale. In either case, the
available pizza products, frozen or refrigerated, need to be
fully baked before they can be eaten. One reason that
refrigerated or frozen pizzas
CA 022~394 1998-12-22
having baked or partially baked crusts are not available
lies in the fact that once a fully baked pizza crust,
which is a bread, has been refrigerated or frozen, it
tends to "toughen" or become leathery, stale and/or dry as
does bread crust. E. David, English Bread and Yeast
CookerY American Edition (Viking Press, New York 1977) ,
page 225. The term "leathery" as used by David and herein
is a term of art. When a crust becomes leathery, it
becomes harder to chew, thereby losing "chewability".
Furthermore, the distinction between the crisper bottom of
the crust and the softer top part of the crust is lost
when a baked crust is refrigerated, regardless or whether
the crust is later eaten cold or reheated.
Reheating pizza, a common mode for consuming
leftover pizza will not make the crust return to its
original state and may serve both to further "toughen" it
and decrease the distinction between the crisper and
softer parts of the crust. Most people have had an
experience with leathery or tough pizza crust when they
have eaten cold or reheated leftover pizzeria pizza.
While such leftover pizza may be fully edible from all
health and safety considerations, the eating enjoyment
obtained from such leftovers are generally less than those
experienced when the pizza was eaten fresh due to the
crust becoming leathery.
For these reasons, fully baked pizzas or pizzas
having a fully baked crust are not often found in grocery
refrigerator or freezer cases.
Refrigerated pizzas with unbaked crust will also
encounter additional problems wh$ch are avoided in a
frozen product. These are (1) the sauce soaking into the
crust (moisture migration), (2) the sauce and other
toppings becoming maldistributed on or knocked off the
crust during transport, and (3) flavor, odor and
microbiological migration, e.g. from sauce or meat to
cheese. While these problems may be avoided to some
extent by turning the refrigerated, unbaked crust product
.
CA 022~394 1998-12-22
into a kit from which a pizza can be assembled, this procedure
will not result in a ready-to-eat pizza as described by the
present invention because the crust of such pizza, in fact the
entire pizza, will still have to be baked in a normal manner
as for a frozen pizza or in a pizzeria.
Thus, there exists a need for a pizza crust which can be
baked, refrigerated and subsequently eaten cold, warm or hot
(i.e. reheated) without further baking and without the crust
becoming leathery or there occurring any significant
degradation of crust properties relative to the same properties
of the crust when freshly baked; and said crust being equally
tasty and chewable either hot or cold.
There further exists a need for a ready-to-eat pizza and
kit containing a baked crust, which kit and crust can be
refrigerated without the crust becoming leathery, dry and/or
stale; said refrigerated crust being equally tasty and
satisfactorily chewable either hot or cold. It is preferable
that the ready-to-eat pizza be provided in kit form, said kit
having the components necessary to assemble a ready-to-eat
pizza.
Thus it is an object of the invention to provide a pizza
crust which may be refrigerated without becoming leathery,
tough, dry and/or stale when served either hot or cold.
It is a further object of the invention to provide a kit,
preferably a kit which can be refrigerated, containing all the
ingredients for assembling a ready-to-eat pizza, said kit
comprising a pizza crust which can be refrigerated without
becoming leathery when served either hot or cold, pizza sauce
and selected toppings for said pizza crust to thereby make a
pizza.
S~ARY OF THE INVENT I ON
In accordance with an embodiment of the present invention
there is provided a kit for making or assembling a ready-to-eat
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pizza, the kit comprising a base tray having a plurality of
compartments; pizza crust, a first topping consisting of a
cheese topping, a second topping selected from the group
consisting of a cheese topping and a non-cheese topping, each
within respective separate ones of the compartments of the
tray; and a top fitted and sealed to the base tray to thereby
hermetically seal the crust and toppings from the atmosphere
and from each other.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective view of a ready-to-eat pizza kit
in accordance with the invention, with the components of said
kit in compartments;
Fig 2 is an exploded perspective view of a ready-to-eat
pizza kit in accordance with the invention;
Fig. 3 is a top plan view of a pizza kit in accordance
with the invention;
Fig. 4 is an elevational view of a pizza kit in accordance
with the invention and the components thereof; and
Fig. 5 is a bottom plan view of a tray suitable for use
to contain the components of the pizza kit of the invention.
DETAILED DESCRIPTION OF THE INVENTION
The invention comprises a fully baked pizza crust suitable
for use in a pizza food product. The invention further
comprises a kit containing said crust and additional components
for the assembly of a ready-to-eat pizza. In a preferred
embodiment, the invention comprises a fully baked pizza crust
which can be refrigerated without development of a leathery
texture
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when eaten cold or reheated, and additional components in
the refrigerated kit containing said pizza crust from
which kit one may assemble a ready-to-eat pizza.
The percentages used herein are baker's
percentages which are weight percents based on the weight
of flour used in a specific recipe, generally per 100
pounds of flour. For example, when 100 pounds of flour
are used in a recipe, 57~ water and 1.5% salt would mean
the addition of 57 pounds of water and 1.5 pounds of salt,
respectively, to 100 pounds of flour. It should be noted
that when baker's percentages are used, the total
percentages do not have to equal 100%.
Baking science involves a complicated process
employing time, temperature and relative humidity to
produce various food products. The time, temperature and
relative humidity parameters are different for bread,
rolls, pizza crusts, pastry and cereal products, not only
with regard to their appearance (crust color, size, etc.),
but also with regard to the development and functioning of
formula ingredients responsible for dough development,
texture and size. Some of the desirable changes caused by
baking are protein denaturing, starch gelatinization,
moisture migration and veracity (cell development or
grain). Although many factors may be involved in
preparing a product which is appealing in the eyes of the
ultimate consumer, a manufacturer must also consider items
such as shelf life and how a consumer will actually use a
product. Consequently, it is desirable to have some
quantitative measure by which one can determine whether a
production line product meets specification. One such
measure is water activity.
Water activity is a measure of the percent of
water remaining in a baked product after it has been
baked. Cracker products typically have a water activity
in the range of about 0.35-0.5. Common baked goods, for
example, bread, dinner rolls and pizza crusts, typically
have a water activity in the range of about 0.9-0.98. In
CA 022~394 1998-12-22
contrast to these common baked goods and pizza crusts, a baked
pizza crust prepared in accordance with the invention will
preferably have a water activity falling in the range of about
0.6-0.85. The preferred water activity range for a pizza crust
prepared in accordance with the invention is about 0.7-0.8.
It has been found that when a pizza crust is prepared according
to the invention and has a water activity within the range of
about 0.6-0.85, such crust has satisfactory refrigeration
storage characteristics in addition to having satisfactory
texture and taste when used to prepare a ready-to-eat pizza,
whether unheated or heated and whether eaten cold or warm.
The water activity of the pizza crust is measured after
the crust has come out of the oven and cooled to about 100~F.
For a pizza crust prepared according to the invention, water
activity is measured about 10-15 minutes after the crust has
come out of the oven and cooled to a temperature of about
100~F. Moisture content may be measured by weight difference
between the crust after it has cooled to about 100~F as above
and has been further dried, for example, in a desiccator, or
by any other suitable reliable manner.
When yeast is used in the preparation of baked goods such
as pizza crusts, a fermentation or rising step should be
included in the dough preparation. The fermentation step
allows the yeast to produce carbon dioxide gas which stretches
and mellows the gluten contained in the flour, and aids in
producing good flavor and texture. However, in large
commercial baking operations such as will be used to prepare
the crusts of the invention, fermenting all the dough to be
baked requires large equipment outlays, is time consuming and
is therefore costly. It has been found that in practicing the
invention, one can produce a flavorful and texturally pleasing
pizza crust by fermenting a portion of the dough and adding an
aliquot of the fermented dough to bulk unfermented dough. The
fermented dough is thoroughly
- CA 022~394 1998-12-22
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mixed with the unfermented dough, the resulting mixture is
divided, cut to size, and baked. In the time period from
mixing to baking, the dough mixture continues to rise and
develop the desired characteristics. It has been found
that a dough mixture containing about 2-7% fermented dough
and about 93-98% unfermented dough produces satisfactory
results. A preferred mixture contains about 3-5%
fermented dough.
The texture of the baked pizza crust of the
invention can be further improved by laminating the dough
somewhat in the manner used to prepare croissants or
Danish pastries. A laminate of three to six layers,
preferably three to four layers, may be formed by folding
the dough back-and-forth across itself. Lamination is
believed to result in a baked product having improved
texture and taste when cold or heated.
A basic recipe (in baker's percentages) for
pizza crust prepared according to the invention will be as
follows: 100 pounds flour, 50-60% water, 4-5% vegetable
oil, 4-5% solid vegetable shortening, 1-1.5% salt, 2-3%
sugar and 0.3-0.7% dried yeast. The flour is hard wheat
bread flour made from hard spring or winter wheat. The
vegetable oil may be any vegetable oil which will not
impart an unexpected or unusual taste. The preferred oils
are corn, canola, sunflower seed, cottonseed and soybean
oils, or mixture thereof, and similar oils and mixtures.
The solid vegetable shortening is a solid, hydrogenated or
partially hydrogenated vegetable oil; for example, a
hydrogenated or partially-hydrogenated cottonseed, corn,
soybean, sunflower, canola, or mixture thereof, and
similar hydrogenated or partially hydrogenated vegetable
oils and mixtures. The preferred solid shortening will
have a butter flavoring agent added to the shortening by
the producer. Alternatively, a butter flavoring agent or
other flavoring agent may be added to the recipe in an
amount known to those skilled in the art or in accordance
with the flavor manufacturer's recommendations.
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Compressed yeast may be substituted for the dried yeast
used in the above basic recipe. If compressed yeast is
used, the baker's percentage or weight is approximately
doubled to account for the water content of the compressed
yeast. Therefore, if compressed yeast is used in the
above general recipe in place of dried yeast, the amount
of compressed yeast will be in the range of about 0.6-2.4%
The following example of a typical pizza dough
according to the invention is given to further illustrate
the invention. The example is not to be considered
limiting or otherwise restrictive of the invention.
Example 1. Pizza Dough.
A pizza dough was made using 100 pounds of
flour, 57 pounds (~) water, 4.3 pounds (%) corn oil, 4.3
pounds (%) solid shortening containing butter flavor, 1.25
pounds (%) salt, 2.3 pounds (%) sugar and 0.5 pounds (%)
yeast. The dough ingredients were mixed, fermented dough
comprising 3-5% by weight of the above ingredients was
added, and the resulting dough mixture was kneaded using
commercial e~uipment and in a manner known to those
skilled in the art. The fermented dough had been
previously prepared according to the same recipe and
allowed to rise or ferment for a sufficient time before
use. Generally, the dough is allowed to ferment until it
is about one and one-half to double in size before use.
After mixing and kneading the dough mixture, the
dough was sheeted, die-cut into circles and transferred to
the belt of a baking oven. The dough is then baked for a
time and at one or more temperatures in a manner known to
those skilled in the baking arts to produce a pizza crust
which has a water activity in the range of 0.7-0.8, after
cooling as described above. While as illustrated in the
Figures, the pizza crusts are preferably circular in
shape, other crust shapes are within the scope of the
invention. For example, the crusts can be triangular,
CA 022~394 1998-12-22
_g_
square, wedge-shaped, shaped like a spaceship or car, or
have other shapes.
The baked pizza crust is then assembled in a
package with other pizza ingredients to form a kit from
which a ready-to-eat pizza can be assembled. The kit
typically comprises the baked crust, sauce, a first
topping comprising a cheese or a mixture of cheeses, and
one or a plurality of additional toppings, said additional
toppings being either cheese or non-cheese. Examples of
sauces include tomato-based, salsa, catsup-based, white
sauce or other spreadable sauce usable to create flavorful
pizza-style products. Examples of the cheeses which may
be included in the kit comprise mozzarella, parmesan,
romano, swiss, cheddar, monterey jack, gruyere, and
similar cheeses as might be used on pizza. Examples of
the additional toppings comprise pepperoni, salami,
sausage including wieners, Italian, Polish and similar
sausages, Canadian bacon, cooked ground beef, cooked ham
or bacon, artificial bacon flavored bits, olives,
anchovies, peppers, onions, shrimp, crab and similar
toppings found on pizza.
The components comprising the ready-to-eat pizza
kit are placed in a food package, when desired together
with a drink, a candy, an implement or utensils to spread
the sauce, and the like. Food packages of the type used
for the ready-to-eat pizza kit of the invention have been
described in the art; for example, in U.S. Patent No.
5,375,701 to Hustad et al. Figs. 1-5 illustrate a type of
packaging preferred for containing the components of a
ready-to-eat pizza according to the invention. Those
skilled in the art will recognize that similar types of
packaging using a greater or lesser number of
compartments, and/or a greater or lesser number of packets
containing the pizza components or ingredients, can be
used in practicing the invention.
A food package containing the components for a
ready-to-eat pizza is generally illustrated in Fig.1. The
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food package 10 comprises a rigid tray base 20 having one
or a plurality of recessed compartments and a top 30 which
can be fitted to base 20 and sealed thereto as illustrated
in Fig. 4, for example by heat sealing. As illustrated in
Fig. 1, base 20 comprises a plurality of compartments
separated by internal flange~ to thereby contain the
components of the pizza kit and to separate selected
components thereof from one another.
Fig. 2 ig an exploded, oblique elevational view
of a ready-to-eat pizza kit according to the invention and
illustrated in Fig. 1; and further illustrating the rigid
base tray 20 with recessed compartments 21, 22 and 23, top
30 made of a material which can be fitted and sealed to
base 20, and the components of the ready-to-eat pizza kit,
said components comprising a packet 40 containing pizza
sauce, a plurality of roughly circular pizza crusts 50,
shredded or cubed cheese or mixture of cheeses 60, a
cheese or non-cheese topping 70 and a packet 80 containing
an additional cheese or non-cheese topping such as, for
20 example, grated cheese, loose cooked sausage or beef,
spices, bacon bits or similar pizza ingredients.
Compartment 23, which is illustrated as having a
circularly shaped portion to accommodate circular pizza
crusts, is further illustrated as having a shelf 24 to
2 5 thereby provide support for crusts 50 when packet 40 iS
placed in compartment 23 under said crusts as is further
illustrated in Fig. 4.
Fig. 3 is a top view of the pizza kit and
packaging illustrating the positioning and separation of
30 components of the ready-to-eat pizza kit of the invention.
Fig. 3 illustrates the positioning of packet 40 within
compartment 23 under crusts 50 and the positioning of
packet 80 (which could include a candy treat, additional
toppings and/or a spreading implement) within compartment
35 23 to the side of crusts so and packet 40.
Fig. 4, from which optional packet 80 has been
omitted for viewing purposes, illustrates the positioning
CA 022~394 1998-12-22
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of packet 40 under crusts 50, the separation of
compartment 21 from compartment 23, and the positioning
and sealing of top 30 to base 20. Top 30 is preferably
made of a transparent, flexible film or sheet material
which can be printed upon if desired. The sheet is
airtightly sealed to the periphery and flanges of base 20,
and can be further sealed to base 20 at a portion of said
base separating one compartment from another in order to
hermetically and peelably seal the contents of the kit
from the atmosphere and from one another. For example, in
Fig. 4, top 30 is sealed to base 20 about its
circumference as illustrated at 29 to hermetically
separate all components of the kit from the external
atmosphere; and top 30 is further sealed to base 20 as at
26 to hermetically separate compartments 21 and 23. The
package as sealed is preferably gas flushed. Individual
components could be gas flushed or vacuum sealed and
placed in a tray in forming the kit.
Fig. 5 is a bottom plan view of preferred base
tray 20 further illustrating compartments 21, 22 and 23,
and the separation between said compartments. Top 30
would be hermetically sealed to base tray 20 around the
circumference as at 29 and between the compartments as at
26, 27 and 28 (see Fig. 3).
2S The following are examples of pizza kits
encompassing the invention. The examples are offered by
way of illustrating the invention and not by way of
limitation. After assembling the pizza kits and sealing
the top to the base tray, the kits are preferably stored
at refrigeration temperatures. For use, the pizza kit
package is opened, the crusts removed and the pizza
assembled using the components in any order the user
desires. Typically, sauce is spread on the crust, the
non-cheese toppings, if any, are placed over the sauce,
and the cheese toppings are then placed on top of all.
The resulting pizza may be eaten as assembled or may be
heated as recommended on the package or as desired by the
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consumer. Heating may be in a conventional or a microwave
oven, microwave heating being preferable due to its speed.
A recommended microwave heating time at full oven power
falls within the range of about 20-80 seconds, and
preferably within about 20-40 seconds in order to preserve
the taste, texture and chewability characteristics of the
crust.
Example 2. PepDeroni P~zz~ ~1t 1.
Using Fig. 2 by way of illustration, a
pepperoni pizza kit in accordance with the invention
comprises a base tray 20 having recessed and separated
compartments 21, 22, and 23 for containing pizza
components, a top 30 sealable to a said base tray and
pizza components; said pizza components comprising a pizza
sauce packet 40, said packet containing a ready to use,
spreadable pizza sauce; a plurality of pizza crusts 50
having a water activity in the range of 0.6-0.85, and
preferably in the range 0.7-0.8; a cheese topping 60; and
a pepperoni topping 70.
Example 3. Pepperoni Pizza kit 2.
A kit is provided as in Example 2 wherein said
kit contains a packet 80 containing a candy treat or an
additional pizza component such as, for example, cheese or
a mixture of cheeses, sausage, anchovies, olives, bacon,
ham, cooked ground beef and similar pizza toppings.
ExamDles 4 and 5. Sausage Pizza Kit.
Kits are provided as in Examples 2 and 3 wherein
the pepperoni is replaced by loose sausage such as, for
example, cooked Italian or Polish sausage; loose cooked
sausage meaning cooked sausage crumbles not in a casing.
Exam~le 6. Double Cheese Pizza.
Rits are made up as in Examples 2 and 3 wherein
the pepperoni is replaced by a cheese and when optional
packet 80 is included, the contents of this packet is a
candy treat or a cheese or a non-cheese pizza topping.
