total time: 2 to 3 days This sour starter is used for making Jewish rye bread. INGREDIENTS: Rye Sour Starter: ½ cup rye flour ⅛ teaspoon active dry yeast 1 cup warm water (110 degrees F) 1 tablespoon crushed caraway seeds 1 teaspoon minced onion Stage One: ½ cup water 1½ cups rye flour 1 recipe Sour Starter Stage Two: ½ cup warm water (110 degrees F) 1 cup rye flour Stage Three: ½ cup water (use warm water if sour has been refrigerated) 1 cup rye flour, or more