Pour quarter cup of the canned tomato liquid into a small saucepan. Add onions and green pepper and bring mixture to a boil. Cover and cook 15 minutes. Stir in remaining sauce ingredients, mixing well. Cover and cook 5 minutes. Remove from heat. To make filling, combine tofu ricotta and 0.75 cup "cheesy" sauce in a small bowl. Mix well. Cook spaghetti according to package directions. Drain. Run spaghetti under cold water to cool. Drain again. Place spaghetti in a large bowl and add oil or stock, egg replacer, and remaining "cheesy" sauce. Mix well. Preheat oven to 350 degrees. Lightly oil an 20 cm square baking pan or spray with a nonstick cooking spray. To assemble casserole: Spread spaghetti mixture evenly in prepared pan. Drop "cheese" filing by tablespoonfuls onto spaghetti. Spread filling over spaghetti, using the back of a spoon. Spoon sauce evenly over "cheese". Bake, uncovered, 35 minutes. Let stand 5 minutes before serving. From the files of DEEANNE