Mix in enough white flour to make dough easy to handle. Turn dough onto lightly floured board. Knead until smooth, about 5 minutes. Grease baking sheet and sprinkle with cornmeal. Shape each half into round, slightly flat loaf.
Place loaves in opposite corners of baking sheet.
Preheat oven to 375 degrees F. Bake loaves in oven for about 30 to 35 minutes. Cool on wire racks when done.