5. Add the levain from the night before, and knead until the dough is smooth (it should take about 10 minutes by hand). You might need to lightly sprinkle your counter with a small amount of flour as you knead to keep the dough from sticking. The dough will be firm and should feel almost like modeling clay and should be easy to work with even if a little bit sticky. If the dough is too firm to knead easily, add a tablespoon or two of water to it. If the dough is too wet, add a tablespoon or two of flour.