The sweet but earthy flavor of this bread is perfectly balanced with a dense, tender crumb to make it everything you want in a homemade Sourdough Pumpernickel Bread recipe.
The night before baking, prepare your sponge. Make sure your sourdough starter is nice and bubbly. Measure out 1 ⅓ cups of sourdough starter and put it into a bowl.
The next day stir in oil, salt and molasses. Add the flour in one cup at a time. If the dough is sticky, add more flour. If it is dry and doesn't want to shape into a cohesive ball, add water.