PRINCIPLES OF GELATINE MAKING
42. GELATINE DESSERTS are those in which gelatine forms the basis. GELATINE is an odorless, tasteless substance extracted from the bones and various tissues of animals. It is used in a variety of forms, such as glue and isinglass, but is also purified and prepared commercially for use in desserts. When it is to be used as a thickening agent in dessert making, it is ground and sold in this form, or it is mixed with sugar, flavoring, and acid, when all that is necessary to make it an appetizing dessert is that it be dissolved in hot water. In both of these forms, it is sold under different trade names. The gelatine itself does not provide any appreciable food value, but it is a means of conveying various foods, such as eggs, milk, sugar, and many kinds of fruit and fruit juices, all of which are more or less valuable for their constituents. In addition, it produces desserts that are appetizing and that may be garnished and served in many attractive ways.
43. To be most satisfactory, gelatine desserts should usually be made just heavy enough with gelatine to retain the desired shape. The heavier they become, the more rubbery they are in consistency and the less dainty and agreeable. Their consistency can be regulated by the proportion of liquid to gelatine that is used.
The general method of preparation followed when plain gelatine is used in desserts consists in first soaking the gelatine in sufficient cold water to moisten it, then dissolving it in hot liquid as near the boiling point as possible, and finally cooling it in order to allow it to solidify. As cold is absolutely essential for the mixture to solidify, it is often difficult to prepare a gelatine dessert in the summer time. Therefore, when a dessert of this kind is desired in the warm weather, it should always be begun long enough before it is to be served to allow it to become thoroughly solid. As it is usually difficult to tell how much time this requires on a warm day, even with a refrigerator or other cold place, it is much safer to overestimate the time required than to underestimate it.
44. Boiling does not, as was formerly thought, destroy the power of coagulation in gelatine for at least some time. Therefore, when necessary, it may be boiled for 10 or 15 minutes without causing any change. One fruit that will prevent gelatine from solidifying, however, is raw pineapple. This is an important point to remember in connection with gelatine desserts. If it is desired to use fresh pineapple with gelatine, it will first be necessary to bring the pineapple to the boiling point in order to destroy the property that prevents the gelatine from solidifying.
45. The proportion of liquid to gelatine is another factor to be reckoned with in the successful making of gelatine desserts. This differs in the various kinds of gelatine, but the proper proportion is usually stated on the package in which the gelatine comes or on a folder inside the package. The amount mentioned is usually what is considered to be ideal for the preparation of gelatine dishes and may generally be relied on. In hot weather, however, it is advisable to use just a little less liquid than the directions require.
In using the different brands of unsweetened and unflavored gelatines, the proportion of liquid to gelatine is usually similar. 1/2 ounce of this granulated gelatine, which is 1/2 of the amount usually put up in a package, will solidify 1 quart of liquid. If this proportion is kept in mind, little difficulty will be experienced in using this form of gelatine. For convenience in measuring small amounts of the granulated gelatine, it will be well to remember that 1 ounce of this material equals 4-1/2 tablespoonfuls. Thus, if a recipe calls for 1/2 ounce of gelatine, it is simply necessary to measure 2-1/4 tablespoonfuls to get the required amount to solidify 1 quart of liquid.