1 c. starter
1 pkg. yeast
1 1/2 c. warm water
5 c. flour plus more for kneading
2 tbsp. sugar
1/2 tsp. baking soda
1/2 tsp. salt

Add yeast to warm water with 1 teaspoon of the sugar. Let stand 5 minutes. In large bowl combine yeast, sourdough, 4 cups of flour, remaining sugar and the salt. Beat well. Let rise in oiled bowl until double. Mix soda in 1 cup flour add to the risen dough. Knead until smooth and satiny. Divide into 2 loaves. Bake at 400 degrees for 45 minutes.