Swedish Apricot Walnut Bread: Biga

In a small bowl, whisk together the bread flour, pumpernickel flour, and yeast. Whisk in the salt. With a silicone spatula or wooden spoon, stir in the water. Continue stirring for 3 to 5 minutes, or until very stiff and smooth. The biga should be tacky enough to cling slightly to your fingers.

Cover the bowl tightly with plastic wrap that has been lightly coated with nonstick cooking s