125ml/4fl oz/½ cup Grand Marnier or orange liqueur
4 tbsp grenadine
1 large orange, cut into 8 slices
8 sugar cubes
1 bottle champagne, cava or Prosecco, chilled
1 Divide the Grand Marnier and grenadine among eight champagne glasses.
2 Add an orange slice and a sugar cube to each glass.
3 Top up the glasses with the champagne, cava or Prosecco and serve immediately.