Watermelon juice

Cut the watermelon in half with a sharp knife.

Scoop the flesh into a blender with a big spoon, removing seeds if not seedless, and pour in the juice left in the shell. Keep the rind.

Squeeze in the juice of half a lime and blend until fully liquefied.

Taste and mix in simple syrup to take off the sharpness.

Pour over ice cubes; garnish with a lime slice and mint leaves if wanted.