Citrus Sangria. 2 c Riesling wine, 2 c grapefruit juice, 1/2 c orange liquor, 2 c champagne, Fresh citrus slices such as lemons, oranges, grapefruit, clementine. Mix Riesling wine, grapefruit juice, orange liquor & citrus slices. Refrigerate for at least 2 hrs. Serve by mixing in champagne & stir. Pour sangria and garnish with fresh citrus slice and a sprig of mint.