To prepare sauce, saute onion in vegetable oil. Once it's softened, add garlic. Add the rest of the ingredients for the sauce except for salt and pepper and cook, uncovered, on medium-low heat for 15 to 20 minutes, or until your flavors come together. Season with salt and pepper.
Preheat oven to 375 degrees F.
Soften vegeatable in small amount of oil. Set aside.
In a large bowl, mix up the rest of the ingredients and stir in 1/4 cup of the sauce mixture. Add your cooked vegetables and lightly mix everything up with your hands.
Gently form into an oval loaf in a shallow baking dish. Spread the top with the rest of the sauce. Bake for about 1 hour.