MEXICAN ONE-POT BEEF AND MACARONI DINNER 1 tablespoon vegetable oil 1 1/2 cups sliced, peeled onions 1/2 pound ground beef chunk or lean ground beef 4 ounces uncooked ziti or large macaroni (1 1/2 cups) 1 green pepper, seeded and cut into 1/2-inch strips 1 16-ounce can stewed tomatoes 1 or more teaspoons chili powder In a heavy, 10-inch skillet heat oil over moderately high heat. Add onions and cook 2 minutes, stirring constantly. Remove onions to a plate. Add beef and noodles to skillet and cook 3 to 5 minutes, stirring constantly, until meat has lost its pink color. Spoon off and discard any fat. Add cooked onions and remaining ingredients to skillet. Cover and cook 30 minutes over moderately low heat, stirring 4 or 5 times. Makes about 4 cups; 4 servings, 56 cents each. Per serving: 275 calories, 17 grams protein, 8 grams fat, 34 grams carbohydrate.