Lauren's Cincinnati Chili

Cook the beef and onion in a large skillet over medium high heat, breaking up beef into tiny pieces, just until meat is no longer pink. Drain and place in a large Dutch oven or slow cooker. Stir in the water, garlic, cumin, cinnamon, allspice, cloves, salt, pepper, cayenne pepper, cider vinegar, Worcestershire sauce, bay leaves, tomato sauce, and chocolate. Simmer over medium low heat for 3 to 5 hours.