How to Make It
To make the crust, bring the water to a boil. Stir in the salt, cornmeal, and butter or margarine. Reduce the heat and cook, stirring often, for 20 minutes. Remove from the heat. Add the Parmesan cheese and parsley flakes. Let cool.
Preheat the oven to 400ºF. Heat the oil in a large skillet. Sauté the onions and garlic until just tender, about 5 minutes. Add the beans, corn, tomatoes, tomato paste, oregano, salt, and pepper. Warm over low heat, about 5 minutes.
Spread half of the cornmeal in an oiled 9-inch pie pan and add the filling. Cover with the grated cheese. Spread the remaining cornmeal over the top of the pie, until the filling is covered. Bake until the top crust is nicely browned, about 1 hour.