2 c. all-purpose flour
3 tbsp. sugar
1 env. active dry yeast (1 tbsp.)
1/2 tsp. salt
2 c. warm water

In a 6-8 cup plastic pitcher or bowl combine all ingredients. Beat with wooden or plastic spoon. Cover bowl with cloth. Set in warm place; let ferment 2-3 days. Stir mixture several times a day.

Replenish every 7-10 days by stirring in equal amounts of water and flour. After replenishing, let stand at room temperature overnight. Occasionally you can add 1 teaspoon of yeast also.