In a large Dutch oven or slow cooker, brown ground beef. Add onion, garlic and green pepper. Cook until vegetables are tender. Add spices, sugar, beer and tomato products. Reduce heat and simmer, covered for 1 hour. Stir occasionally. Stir in beans and chocolate. Simmer covered for 20-30 minutes. Stir well before serving. Note: Prepared chili may be frozen up to 2 months.