Champagne Sangria - 2 cups Riesling wine, 2 cups, grapefruit juice, 1/2 cup orange liquor, 2 cups champagne, Fresh citrus slices, Fresh mint for garnish Mix Riesling wine, grapefruit juice, orange liquor and citrus slices. Refrigerate for at least 2 hours. At time of service, mix in champagne and stir. Pour sangria and garnish with fresh citrus slice and a sprig of mint.