Make the simple syrup: Bring the sugar and 1/2 cup water to a boil in a saucepan over medium heat, stirring until the sugar dissolves; let cool.
Combine the orange juice, lemon juice and 1/2 cup simple syrup in a punch bowl. Add the gin and elderflower liqueur and stir. Fill with ice, then add the champagne. Garnish with lemons, strawberries and pepper.
Photograph by Charles Masters
Recipe courtesy Food Network Magazine