Cocktail de Agua de Valencia (Valencia Water Cocktail)

1/4 liter  Cava  (or Spanish Sparkling White Wine) 
3/4 liter  Orange Juice 
1 dl  Cointreau
50 g  Sugar 

Pour all ingredients in a pitcher (the Cava must be very cold). Stir in a pitcher glass and serve in Champagne or Martini short glasses.