EXPERIMENT 24: SEPARATION OF STARCH GRAINS WITH SUGAR.—Mix 1 teaspoonful of flour with 1 teaspoonful of sugar. Add 2 table-spoonfuls of boiling water, stir, and heat. Is the mixture smooth? Carefully explain the use of sugar in the mixture.
EXPERIMENT 25: SEPARATION OF STARCH GRAINS WITH FAT.—Mix 1 teaspoonful of flour with 1 teaspoonful of fat. Add 2 tablespoonfuls of boiling water, stir, and heat. Is the mixture smooth? Explain the use of fat in this mixture.
To cook starch successfully, it is necessary to swell every grain of starch contained in the starchy food. To accomplish this each grain must be surrounded by heat and moisture. In vegetables and cereals, the cellular framework separates the starch grains so that they are uniformly cooked. Since there is nothing to separate the grains in a powdered starchy substance, as shown in the foregoing experiments, it becomes necessary to mix it with certain materials so that the heat and moisture can penetrate every grain at the same time.
BLANC MANGE
2 cupfuls milk 1/4 cupful corn-starch 1/2 cupful sugar 2 teaspoonfuls vanilla Nutmeg 1/8 teaspoonful salt
Scald the milk in a double boiler. Mix the sugar and corn-starch. Add the hot milk slowly to the sugar and corn-starch mixture, stirring rapidly. Return to the double boiler and cook 30 minutes, stir rapidly until the mixture thickens. Add the salt and flavoring and pour into a mold which has been moistened with cold water. Cool, turn from the mold, and serve with sugar and cream.
If a softer and more creamy dessert is desired, the corn-starch may be reduced to 3 tablespoonfuls. If this quantity of thickening is used, the cooked dessert should be poured into sherbet glasses or other suitable dishes for serving; it will not become stiff enough to mold.
NOTE.—While cooking Blanc Mange, note the number of minutes that is required to thicken the mixture and the length of time of cooking given in the recipe. Why is it necessary to cook the mixture for so long a time after it thickens? (See Cereals.)
CHOCOLATE CORN-STARCH PUDDING
Proceed as for Blanc Mange, using 3/8 cupful of sugar instead of 1/4 cupful. Cut into pieces 1 square (i.e. 1 ounce) of Baker's chocolate. Add to it 1/4 cupful of boiling water. Stir and heat until smooth and thoroughly blended. Add this to the corn-starch mixture just before taking from the fire. Add 1/2 teaspoonful of vanilla. Mold and serve as Blanc Mange.