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Mix the Martini and gin together and chill or store in a bottle if making ahead. If you have room in your fridge or freezer, chill your Champagne glasses, too.
When your guests are due to arrive, spoon ½ tsp icing sugar into 8 Champagne glasses. Pour over the Martini mixture, mix with a spoon and add the frozen raspberries. Top up with the sparkling wine just before serving.