1 pkg. active dry yeast
1/2 c. warm water
2 c. warm water
2 c. flour
1 tbsp. sugar

Soften yeast and 1/2 cup warm water. Stir in remaining ingredients. Beat until smooth. Cover with cheese cloth. Let stand at room temperature 5-10 days stirring twice a day. Cover and refrigerate until ready to use.

To keep starter growing, after using some starter, add 3/4 cup water, 3/4 cup flour and 1 teaspoon sugar to remainder. Let stand at room temperature at least one day. Cover and refrigerate for later use. If not used within 10 days, add 1 teaspoon sugar. Repeat adding sugar every 10 days.