Mix together the yeast and warm water and let it sit for 10 minutes. Place the 3 cups of flour, salt and sugar in a mixing bowl (or food processor, if you are using), and knead until you have smooth dough. Cover the dough with cling wrap and leave it in a warm place for 20-30 minutes to proof. Shape the dough in a ball and roll it with a rolling pin over the whole wheat flour. Grease lightly the pizza pan and place the rolled pizza over it, apply the toppings and bake in a preheated oven at 350 F until ready. If the bottom is taking longer to cook, remove the pizza pan from under the pizza.