A boule is one of the easiest and most satisfying breads to make. Mix 400 g flour, 280 g water, 4 g yeast and 8 g salt. Let sit overnight in a bowl covered with plastic wrap. In the morning, stretch the top of the dough around to form a ball and place on a baking sheet, dust with flour, and cover with plastic wrap. Let sit for about an hour then bake in. 400 degree oven until the internal temperature is about 190° F (roughly 30 minutes). Let cool before slicing.