Stir together ale, apple cider, port, lemonade, brown sugar, diced apple, whole allspice, 2 (3-inch) cinnamon sticks, whole cloves, cardamom in a 5-qt. slow cooker. Cover and cook on LOW 3 hours or until hot. Remove diced apple, if desired. Ladle into mugs. Garnish, if desired.
Note: We tested with Sierra Nevada Tumbler Autumn Brown Ale.