It is a more convenient method, for although the sponge will rise in four hours it can stand longer than the straight dough without deterioration, and many kinds of bread, coffee cake, and rolls can be made from one sponge.
All dark breads have a more attractive color if one tablespoonful of dark molasses is added to the sponge, but this hastens the rising; so, if the sponge is to stand overnight, do not add it till morning when the bread is mixed.
Salt retards the rising, so it is better in cold weather to add that when the bread is made up.
Whole Wheat Sponge
Scald three cups of milk and let it stand till it is lukewarm. Add one teaspoonful of salt and one tablespoonful of molasses and one yeast cake that has been dissolved in one half cup of warm water. Stir in enough whole wheat flour to make a drop batter. Beat well and put it in a covered dish to rise. Use as directed in the bread recipes. Water can be used in place of milk.
Potato Sponge
Mash or put through a ricer enough hot boiled potatoes to make two cupfuls. Add two cups of whole wheat flour and mix well. Pour over this two cups of the water in which the potatoes were boiled; this should be hot enough to thoroughly scald the mixture. Add one tablespoonful of molasses and two teaspoonfuls of salt. Stir till it is a smooth batter. If this is to be made into a sponge at once, add one cup of cold water, and when the batter is lukewarm add one yeast cake that has been dissolved in one cup of lukewarm water. Set it to rise four hours.
The potato and flour mixture may be made and scalded at any time that it is convenient to cook the potatoes and can stand until it is wanted for the sponge. If it has become cold, add one cup of water hot enough to make the mixture lukewarm and proceed as directed with the yeast.
Corn Meal Sponge
Boil four medium-sized potatoes in one quart of water. When done pour three cups of the boiling potato water over one and one half cups of corn meal and stir till it is smooth. Add one and one half cups of the potato that has been mashed or put through a ricer, one tablespoonful of salt, and one of molasses. When this is lukewarm, add one yeast cake that has been dissolved in one cup of lukewarm water. Set it to rise and use as directed in the recipes for sponge bread.