Chop the mint leaves finely with a knife. Pour the Fabbri mint syrup and the prosecco into a jug.
Add the juice of 1 lime and the chopped mint leaves, then mix well.
Pour the mixture into the ice lolly moulds, insert the sticks and freeze for at least 3 hours (the freezing time depends on the size of the moulds used).
Remove the lollies from the moulds and serve immediately.