Make filling by browning and breaking up meat in skillet over medium heat.Add the chopped onions and chopped green bell pepper. Cook 10 minutes til soft. Drain off grease.
Mix the tomato sauce, corn, chopped black olives, salt, chili powder and ground cumin in a pot. Add meat mixture and simmer 20 minutes til thick. Add cheese, stir til melted. Pour mixture into a 9 inch baking or casserole dish.
Make crust by placing the cold water, salt and cornmeal with the margarine or butter in a pot. Cook over medium heat, stir occasionally til thick. add butter, mix well.Spread crust mixture over meat mixture. Bake uncovered in oven at 375 for 40 minutes til crust is golden. Serves 6