Place half the strawberries in bowl and sprinkle with the granulated sugar and kirsch. Let macerate for 15 minutes. Puree the remaining strawberries together with the confectioner's sugar. Whip the cream into stiff peaks. Reserve a quarter of the whipped cream for garnish and refrigerate. Carefully fold the remaining cream into the pureed strawberries. Arrange the macerated strawberries in 4 wine glasses, reserving a few slices for garnish. Fill the glasses with strawberry cream, cover with plastic wrap and refrigerate for a few hours. Pipe the reserved whipped cream through a pastry bag fitted with a star tip and decorate with sliced strawberries.