Sourdough Starter
["1 pkg. active dry yeast", "2 1/2 c. warm water", "1 c. instant nonfat dry milk", "2 Tbsp. sugar", "4 c. flour"]
["Stir yeast, water, milk and sugar in 2 1/2-quart crock or other nonmetallic bowl until yeast is dissolved.", "Stir in flour until a smooth batter forms.", "Let stand loosely covered in a warm place for 3 to 5 days.", "Stir down occasionally.", "Store loosely covered in refrigerator."]
["active dry yeast", "water", "milk", "sugar", "flour"]