Slow Cooker Cincinnati Beef Chili

Ingredients

• 2 pounds coarsely ground beef
• 2 onions, finely chopped
• 1 large bay leaf
• 1 (15 ounce) can tomato sauce
• 2 tablespoons cider vinegar
• 1 tablespoon Worcestershire sauce
• 2 teaspoons minced garlic
• 2 teaspoons salt
• 2 teaspoons ground cinnamon
• 1 1/2 teaspoons cayenne pepper
• 1 teaspoon ground cumin
• 1/2 teaspoon ground black pepper
• 1/2 teaspoon ground allspice
• 1/2 teaspoon ground cloves
• 1/2 ounce unsweetened chocolate, grated