Start to finish: 2 hours (15 minutes active)/Servings: 12 8 cups grape juice 2 cinnamon sticks 1 tablespoon whole cloves 1 tablespoon whole allspice Three 1-inch slices fresh ginger 3 cups green grapes, peeled or not Three 12-ounce bottles ginger beer or ale, chilled In a large saucepan over medium heat, combine the grape juice, cinnamon sticks, cloves, allspice and ginger. Bring to a simmer, then remove from the heat. Allow to cool to room temperature, at least 1 hour.