The pear and apple flavors give a deep fruitiness to the final cocktail, so you could equally well use a sparkling white wine as the base.
1 measure Calvados
1 measure pear nectar or
½ measure pear liqueur
Slice of firm ripe pear, to decorate
1. Pour the Calvados and pear nectar or liqueur into a chilled flute with the slice of pear.
2. Top up with chilled champagne.