FATS:
Fats are both a moisturizer and tenderizer. Fats make a cake light and hold tiny
air bubbles created through creaming.
These bubbles are then expanded by the gases from the
leaveners. Fats also coat the
flour proteins like a raincoat
preventing a lot of moisture from reaching them and creating too much gluten or
toughness when mixed. Oil makes the moistest cakes because it does an excellent
job at coating the flour proteins, but it does not hold air. Fat is also a good
tenderizer because it slows down the coagulation of the egg, flour and milk
proteins that set the structure of the cake when baked. As the fat level in a
cake goes up, more eggs are required to emulsify the fat. Eggs also add
structure and thus increase the volume; therefore less leavening agent, such as
baking soda or baking powder, is needed.
A history byte:
Many of the changes from old-fashioned cakes to the recipes we see today,
started with the development of cake mixes and the addition of emulsifiers to
the shortenings such as Crisco. Before then, cakes tended to be heavier, more
like the pound cake consistency. Shortening used today gives better aeration
when mixed and with the addition of liquids, make a light and fluffier cake.
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SARAH SAYS:
Dense cakes such as carrot, zucchini, apple
and pumpkin are commonly made with vegetable oil. The liquid
oil acts more rapidly than softened butter to coat the protein molecules
in flour, preventing the formation of gluten which makes the cakes tough.
Because of this, dense cakes made fruit purees, fruit and with oil are
more moist and tender than those made with butter. The fruit adds
moisture, too. |
SWEETENERS: In a cake recipe,
sugar tenderizes, moisturizes and aerates when fat is beaten with it, called
"creaming". Different sugars will produce
different results. Use superfine sugar for the
finest texture and maximum volume. More:
Sugar tenderizes by preventing the flour proteins from forming
gluten because it attracts the
moisture in the recipe, taking it away from the flour proteins. This prevents
the formation of gluten that occurs when wheat flour and liquids are mixed.
Sugar also tenderizes by slowing down the coagulation of the egg, flour and milk
proteins that set the structure of the cake when baked. Sugar can stand in for
fat and is often added to commercial low-fat products or recipes. However, try
my low-fat recipes here with no increase
in sugar.
Changing the amount of sugar can upset the
balance of the cake. Note that when the sugar is reduced, the gluten structure
is so strong that the cake develops some long cells or tunnels. Overall volume
may even increase, but the cake would be tough. However when sugar is increased,
the cake is so tenderized that the gluten is unable to maintain the volume of
the balanced cake. The cake with excessive sugar may be so tenderized that it
crumbles when cut rather than staying in slices.
EGGS:
Whole eggs contains proteins that set or coagulate from the oven's heat and form
the structure of the cake. Separated egg whites and/or yolks called for in some
recipes perform different roles. However, separated eggs do not have as great an
effect on the structure of the cake the way that whole eggs do. Beaten egg
whites are used for leavening as are beaten yolks. If your cake is dry,
substitute 1 large egg for two large egg yolks because the yolks contain
lecithin, an emulsifier. Egg whites are the opposite because they have a drying
effect. When I developed recipes for my
book,
The Healthy Oven Baking Book, the way I lowered fat was to substitute
one egg with two egg whites. But, in just about every recipe, I made sure I
always kept one whole egg in the recipe before substituting the other ones for
tender and flavorful recipes.
LEAVENERS:
Chemical leaveners such as baking powder and baking soda are typically used in
cake recipes, but beaten egg whites and yolks provide for leavening, as well.
Chemical leaveners only expand the air bubbles beaten into the batter; they do
not create new ones. The biggest failure of a cake recipe is using expired
baking powder or baking soda, so make sure they are fresh. Also, when a batter
is placed in an oven that has not been preheated, the leaveners fail to act
until the oven reaches over 120 degrees F.
DAIRY: Milk contains proteins (as do
eggs and flour) that set or coagulate from the oven's heat and form the
structure of the cake. When I developed the healthy
White Cake Recipe, a classic
butter-cake recipe reduced-in-fat, I added instant nonfat dry milk powder to
help strengthen its structure. Other dairy products, such as buttermilk, sour
cream or cream cheese add more moisture and flavor to a cake, consequently those
made with them keep well. The acid in the buttermilk and sour cream contains
acids which tenderize the gluten
in the recipe, producing a fine crumb. Sour cream and cream cheese add richness
to a recipe, which makes them super moist and almost springy.
Q:
Can I
substitute juice or milk instead of water ?
A: Yes, but it doesn't always work. Use only
fresh juices, as canned ones contain methyl silicone which can prevent
cakes from rising to their full potential. Fresh juice should be used in
ratio with water to avoid a dry, coarse texture. When substituting water
with milk, use the exact amount specified by the recipe. And, you may need
some baking soda if you add in acidic milks, such as buttermilk or sour
cream or juice, such as lemon, lime or orange.
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FLAVORINGS:
Flavoring for a cake comes in different forms: ground spices, extracts, citrus
zest (peel), citrus oil and even liquors. When using liquor, use small amounts
as it tends to dry out cakes. It can even cause your cake to fall if there is
too much in liquid flavorings in proportion to the other ingredients in the
mix.
PUDDING: Some cake recipes and mixes
call for added pudding. Instant, not cooked pudding should be used in the
recipe. The use of cooked pudding will result in a drier, coarser, grittier
texture. That’s because it has not been activated or pre-gelatinized, as instant
puddings have, affecting the cake.