Add the watermelon to a Creami tub, followed by 1 tbsp lemon juice and 1 tsp honey or agave syrup then top this with the galia melon. Cover and transfer to the freezer for 24 hours, or until frozen through.
When ready to serve, pour in 75ml (2½fl oz/⅓ cup) water and the remaining lemon juice and 1 tsp honey. Churn on TOP, SORBET in your Creami, so that y