Preheat oven to 350 degrees. Heat corn oil in a large skillet, and saute onions until light golden brown. Add garlic at the last minute, and brown quickly. Remove to a bowl with a slotted spoon, and saute green peppers in remaining oil. Add to bowl, and refrigerate.
Cut crusts off bread, cube and soften with water in a strainer. Squeeze out excess liquid.
In a large bowl, thoroughly blend meats and bread, working them together with your hands lightly. Add onion-garlic- green pepper mixture and all the other ingredients, Blend thoroughly.
Place mixture in a loaf pan and score a crisscross design along the top with a knife. Bake 50 minutes, pour off accumulated fat, add your favorite tomato sauce, and continue baking for 20 minutes more.