Two 12-ounce bottles American lager, such as Budweiser
12 pitted fresh or frozen cherries
3 ounces orange liqueur, such as Grand Marnier
10 1/2 ounces sweet vermouth
9 ounces bourbon
2 tablespoons bitters
Pour the beers into an 8-by-8-inch baking dish. Freeze until slushy, whisking every 30 minutes, for about 4 hours. Meanwhile, put the cherries in a small bowl and pour the orange liqueur over. Cover and refrigerate for 4 hours. For each cocktail, spoon about 1 cup beer slush into a rocks glass. Pour 1 3/4 ounces sweet vermouth, 1 1/2 ounces bourbon and 3 dashes bitters into a cocktail shaker. Fill with ice, shake and strain over the slush in the glass. Garnish with 2 liqueur-soaked cherries. Serve immediately.