Spaghetti Sauce with Meat

• 1 pound hamburger
• 1 large onion, cut up fine
• 1 8-ounce can of spaghetti sauce with meat
• ½ teaspoon garlic salt 
• 2 tablespoons cooking oil
• 1 8-ounce can tomato sauce
• 2 tablespoons vinegar
• 1/3 cup grated Parmesan cheese
• Salt and pepper

Brown hamburger meat in oil; add onion and cook until lightly browned. Add canned spaghetti sauce, tomato sauce, vinegar and seasonings; also grated cheese. Cover and simmer for ½ hour. Serve over spaghetti.