Place the seedless water melon chunks (with the rind removed) into the Thermomix bowl.
Puree on Speed 8, 10 seconds.
Add the vodka and lemon juice and mix on Reverse, Speed 5, 10 seconds.
Pour into glasses (fill about 1/4 of the way to the top - more or less depending on how strong you like it)
Top up with lemonade and add mint leaves to decorate.