Sourdough Dinner Rolls

Servings: 36. Dissolve yeast in potato water, let set until foamy, 5 to 10 min. Heat milk and 1/2 c butter or margarine until just melted, cool to lukewarm. Combine starter, yeast mixture, milk mixture, sugar and salt. Add flour to make a stiff dough, knead until smooth and elastic. Place in a greased bowl, turn dough to coat surface. Cover and let rise in a warm place, free from drafts, until doubled, about 1 hour. Punch down dough, cover and let rest 10 minutes. Shape into rolls. Place on a greased baking sheet. Cover and let rise in a warm place, free from from drafts, until doubled, about 45 minutes. If desired, brush with melted butter or margarine before baking in a preheated 375F oven for 12 to 15 minutes or until golden brown. Makes 3 to 4 dozen.