In a Dutch oven, cook beef, pork and onions over medium heat until meat is no longer pink. Add garlic; cook 1 minute longer. Drain

Add the beans, tomatoes, vinegar, cocoa and seasonings; bring to a boil. Reduce heat; cover and simmer for one and a half hours or until heated through.

Discard bay leaves. Serve with spaghetti. Garnish with cheese, sour cream, tomatoes and onions.