Prepare watermelon juice: Remove the pulp from the watermelon, cut it into pieces of arbitrary size, wipe in small portions through a fine sieve. To make the pulp rub faster, you can remove all the bones in advance. Pour the resulting juice into a jug.
Put 4-5 mint leaves at the bottom of the glass, add sugar and lightly crush with the handle of a knife. Add lemon and watermelon juice.
* If only adults will drink this cocktail, then you can add 50 ml of light rum or gin.