Ingredients

• 1/2 cup sugar
• 1/2 cup water
• 1 cup white grape juice
• 1 1/2 cups fresh grapefruit juice (preferably pink or ruby red)
• 1/4 cup fresh lime juice
• 1/4 cup fresh lemon juice
• 1 cup dry white wine
• 1/4 cup Cognac or other brandy
• 1/2 cup packed mint leaves
• 1 navel orange, cut into 1/2-inch pieces
• 1 lime, cut into 1/2-inch pieces
• 1 lemon, cut into 1/2-inch pieces
• 1 (750-ml) bottle Champagne or other sparkling white wine, chilled

Instructions

1. Bring sugar and water to a boil in a small saucepan, stirring until sugar has dissolved, then transfer to a bowl and cool syrup completely (or quick-chill by setting bowl in an ice bath and stirring occasionally until cool).
2. Stir together juices, wine, Cognac, mint, fruit, and cooled syrup in a large pitcher. Chill, covered, until cold, about 1 hour. Stir in Champagne.