The next day, skim the solid fat from the top of the pan, and discard the fat. Place the beef mixture over medium heat, and stir in tomato sauce, vinegar, Worcestershire sauce, garlic, chocolate, chili powder, salt, cumin, cinnamon, ground, cloves, allspice, crushed red pepper, and bay leaf. Bring to a boil, reduce heat to a simmer, and cook, stirring occasionally, for 1.5 hours. Add water if necessary to prevent the chili from burning. Remove Bay leaf before serving. Best if refrigerated overnight.