1 pkg. dry yeast
1 1/2 c. warm water
1 c. Sourdough Starter
2 tsp. salt
2 tsp. sugar
5 1/2 to 6 c. sifted flour
1/2 tsp. baking soda

In large mixer bowl, soften yeast in the warm water. Blend in Starter, salt, and sugar. Add 2 1/2 cups of the flour. Beat 3 to 4 minutes with the electric mixer. Cover; let rise until light and bubbly, about 1 1/2 hours. Combine soda and 2 1/2 cups of the flour; stir into the dough. Add enough additional flour to make a stiff dough. Turn out onto lightly floured surface; knead 5 to 7 minutes. Divide dough in half; cover and let rest 10 minutes. Shape into 2 round loaves. Place on lightly greased baking sheets. With sharp knife, make diagonal slashes across top of loaves. Let rise until double, 1 to 1 1/2 hours.

Bake in 400 degree oven for 35 to 40 minutes. Brush with melted butter. Makes 2 loaves.