Gin and tonic syrup
Bring the tonic and sugar to the boil in a pan, simmer for approx. 2 mins. until the sugar has dissolved. Add the gin, leave to cool, pour into a measuring cup.
Place the blackberries and lemon balm leaves in the ice lolly moulds, as desired. Pour in the gin and tonic syrup, freeze the ice lollies for approx. 12 hrs., inserting the ice lolly sticks after approx. 2 hrs.