Ingredients
1 teaspoon dry yeast
1 cup warm water
2 cups buttermilk, room temperature
2 tablespoons sugar
1 3/4 cups rye flour
Preparation
In a large mixing bowl, combine yeast and the water; let stand until yeast is dissolved and bubbles form on the surface, about 5 minutes.
Stir in buttermilk, sugar, and 1 1/2 cups flour. Cover with a kitchen towel, and let stand in a warm place 24 hours. Whisk in another 1/4 cup flour until it is well combined. Set aside, covered, another 24 hours before using or storing in a jar or airtight container.
