Add the flour a half cup at a time, mixing thoroughly. Once the dough starts to form a ball (at about 2 cups of flour) dump on to a clean countertop to knead. Add more flour as you knead the dough, just enough to prevent sticking. Knead for about 5 minutes”squishing and pushing away from you, then folding and pressing back towards you. The dough should be smooth, springy, and firm, but not dry.