In large skillet cook onions, beef and sausage over medium heat until meat is browned (10 to 12 minutes); pour off fat. Meanwhile, in dutch oven combine remaining ingredients EXCEPT spaghetti. Cook over medium heat, stirring occasionally, for 15 minutes. Reduce heat to low; add browned meat. Cook, stirring occasionally, until stew is thickened (20 to 30 minutes). Meanwhile, cook spaghetti according to package directions. Serve stew over spaghetti.
Makes 6 servings.