Sugar is commonly used as a preservative in jams and jellies, and enhances the color and flavor
of various fruits. The addition of sugars to jams and jellies is also essential to the gelling process,
to obtain the desired consistency and firmness.
2. Baking
Sugar helps tenderize bakery products and provides a source of nourishment for the growth of
yeast, which helps the leavening process (e.g. breads to rise). The browning reaction that sugar
undergoes when exposed to heat adds flavor, and contributes to the appearance of color that can
be seen on baked goods such as the crusts of bread and the browning of cookies.
3. Canning and Freezing
Sugars are added to canned fruits and vegetables to improve flavor, enhance texture, and
preserve natural colors. Sugars are also used to slow the freezing process, and prevent large ice
crystals from forming in frozen sweet mixtures, such as ice cream. Large ice crystals can create a
gritty texture, while the formation of smaller ice crystals results in a smoother product, providing
a more desirable texture. Sugars also increase the thickness of frozen desserts, imparting a thick,
creamy texture in the mouth.
4. Candy
Sugar (sucrose) is the primary ingredient in a wide variety of candies, largely due to its
solubility. In its simplest form, candy is made by dissolving sugar in water, and heating the
solution. As the temperature rises, more sugar can dissolve. The solution is boiled until no more
sugar will dissolve (a "supersaturated" solution). As the solution continues to boil, the water
evaporates, making the solution more concentrated. When the solution cools, the sugar's
solubility decreases and the sugar crystallizes out of solution. The type of candy that is being
made (and its desired consistency) determines the degree of sugar concentration, and the extent
to which sugar particles are recrystallized.
5. General Cooking
Sugar is a key ingredient in the preparation of custards, puddings, and sauces. These food
products depend on sugar to perform a number of functions, in addition to its role as a sweetener.
In custards, sugars help to breakdown proteins in egg whites so that they are more evenly
dispersed in the liquid mixture. This permits the egg mixture to thicken slowly, mixing with the