Water melon smoothie

Cut the flesh into small pieces and remove the seeds.
Coarsely crush the ice cubes.
Put into a mixer together with the lemon juice and purée.
Put the smoothie into 4 glasses and serve immediately, since otherwise the liquid will quickly separate again.
Absolutely refreshing and delicious. If your melon is not very sweet, you can add some honey.
...despite the refreshment, do not forget to add the smoothie to your fluid count!