Corn bread

350 ml of water
3 tablespoons oil
2 tablespoons cornstarch FLOUR
1 tablespoon vinegar (20%)
3 teaspoons salt
1 tablespoon powdered sugar
800 gram flour
20 grams of yeast

In yeast +
Preparation of yeast, 1-2 days before cooking.
yeast:
140 ml of water
150 grams of flour
1 tablespoon oil
½ teaspoon salt
20 grams of yeast