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To decorate the glasses with a sugar rim, tip the sugar onto a flat plate and the lemon juice into a bowl. Dip the rim of each glass in the juice, then the sugar.
Put the gin, lemon juice, sugar and elderflower cordial into a large jug. Stir until the sugar has dissolved. Add the prosecco, then the sorbet, and give it a good stir. Pour into the prepared glasses and pop in a few strips of lemon zest.