You’ll Need:

1 cup warm water
1 tablespoon yeast
1 tablespoon white sugar
1 cup rye flour

1 teaspoon yeast
1 teaspoon white sugar
1/2 cup warm water
1 cup rye flour

1 tablespoon white sugar
1 tablespoon kosher salt
1 cup warm water
2 cups rye flour
1 cup sifted all-purpose flour (optional)

Directions : In a large bowl, combine 1 cup water, 1 tablespoon yeast, 1 tablespoon sugar, and 1 cup rye flour. Cover batter with a damp cloth, and place in a warm, draft-free spot.
In the evening, mix in 1 teaspoon yeast, 1 teaspoon sugar, 1/2 cup warm water, and 1 cup rye flour. Cover again, and set aside overnight.
In the morning, mix in 1 tablespoon sugar, 1 tablespoon kosher salt, and 1 cup warm water. Gradually mix in 2 cups rye flour and 1 cup of all-purpose flour (if using). When the dough has pulled together, turn it out onto a lightly floured surface and knead for about 5 minutes. Form into a loaf, and place on a baking sheet. Allow to rise for about 40 minutes.
Preheat oven to 375 degrees F (190 degrees C). Bake for about 30 minutes, or until the bottom of the loaf sounds hollow when tapped