Sparkling strawberry cocktail

Ingredients-  450g strawberries, hulled, 1 tbs icing sugar,  Crushed ice (optional), Two third  cup (165ml) vodka, chilled, 1 bottle sparkling wine, chilledMethod- Place the strawberries and icing sugar in a blender or food processor and blend or process until mixture forms smooth puree,  Pass the puree through a fine sieve into a bowl and discard the seeds in the sieve. Cover the puree with plastic wrap and chill in the refrigerator, Half-fill 8 champagne flutes with the crushed ice, if using. Divide the chilled strawberry puree among the flutes, and then top each with 1 tablespoon vodka. Top up with the sparkling wine.