Dissolve yeast in 1/2 c. warm water. Let stand 5 minutes. Combine next 3 ingred. in a med. sized nonmetal bowl. Mix well. Gradually stir in 2 c. warm water. Add yeast mixture and mix well. Cover loosely and let stand for 72 hrs. in a warm place stirring 2-3 times per day. Place fermented mixture in refrgerator, and stir daily; use within 11 days. To use, remove sourdough starter from refrigerator and let stand at room temp. for at least 1 hour. Stir well and measure amount of starter needed for recipe.
Replenish remaining starter with Herman Food, and return to the refrigerator; use within 2-14 days, stirring daily.
Makes: about 2 c. starter
Herman Food: 1/2 c. sugar, 1 c. flour, 1 c. milk