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The day before you want to serve, put the grapes in the freezer for around 8-12 hrs or until frozen. Chill the prosecco and apple juice in the fridge.
When you're ready to serve, put the frozen grapes and a generous handful of ice in a large 2-3 litre punch bowl and pour all of the remaining ingredients on top. Stir gently to combine, then serve. Sits well for up to 3 hrs before putting the ice in.