CRUST:
1 1/2 cups coarse cornmeal
1 teaspoon salt
1 1/2 cups cold water
2 cups boiling water (in a saucepan)
A little olive oil
FILLING:
1 tablespoon olive oil
1 small onion, thinly sliced
1/2 cup thinly sliced bell pepper
10 mushrooms, sliced
1 small zucchini, thinly sliced
5 to 6 medium cloves garlic, thinly sliced
2 teaspoons dried (or 2 tablespoons minced fresh) basil
1/2 teaspoon dried oregano
Freshly ground black pepper
1/4 pound mozzarella, grated
2 small (or 1 medium-sized) ripe tomato, sliced