2. Switch to a dough hook and knead until it becomes a smooth pliable ball of dough. It should pull away from the side of the bowl and hold itself. It will take about 3-5 minutes of mixing on low speed.
3. Grease a large mixing bowl, place the dough in it, cover, and allow to proof for 4-6 hours. (The time will depend on the strength of your starter and the temperature of your house). The dough needs to be doubled.