Classicist bartenders have resurrected the centuries-old ritual of the formal punch service. Here, Philip Ward of New York's Death & Co. makes a potent concoction named after the old British slang for gin. More Party Punch Recipes
In a large pitcher, stir the sugar with the club soda until dissolved. Stir in the gin, grapefruit and lemon juices and sweet vermouth and refrigerate until chilled, about 1 hour.
Transfer the punch to a large bowl. Gently stir in the Champagne and float the grapefruit wheels on top. Serve in punch glasses over ice.