In a large clean bowl, pour in the olive oil
Add in the zest of 1 lemon and squeeze the juice of half the lemon.
Chop mint and and add to the vinaigrette.
Stir and add in the watermelon cubes.
Mix together.
Crumble feta over.
Chop the rocket roughly and toss into salad.
Squeeze the juice of the other half lemon.
Add salt and freshly ground pepper.
Toss together.
Serve immediately.