Method:
For the dough, dissolve yeast in warm water and set aside for 3 to 4 minutes. Combine milk, oil and cornmeal in a large bowl. Add yeast mixture, then salt and rye flour, mixing well. Gradually add white flour making a soft workable dough. Turn onto a floured surface and knead for 5 minutes. Put dough in an oiled bowl and turn once to coat with oil. Cover bowl and let dough rise in a warm place for about 40 minutes or until doubled in bulk.
After dough has doubled in bulk, preheat oven to 500°F. Form dough into a round ball (for 2 9-inch pizzas make 2 balls). Roll out on a floured surface, turning it regularly to keep a round shape. It should be about 1/8-inch thick. Lay dough on an oiled pizza pan and brush lightly with olive oil.
For the toppings, spread sliced onion over dough, followed by Fontina, pine nuts and Gorgonzola. Arrange tomatoes over cheese and sprinkle lightly with salt and pepper. Bake pizza for 8 to 12 minutes until crust is crisp and golden. Remove from oven and sprinkle with Parmesan, basil and thyme. Serve immediately.