You will need:
500g (17 1/2oz) watermelon
200g (7oz) feta cheese, crumbled into pieces roughly 1-2cm (1/2-3/4in) square
Finely grated zest and juice of one lime
2 teaspoons mint, chopped
Sometimes I add 50g (2oz) of pumpkin seeds, toasted in a moderate oven for four minutes or so.
Peel, deseed and chop the watermelon into 4cm (1?in) pieces. Place in a bowl, and add the crumbled feta, the finely grated lime zest, the lime juice and the chopped mint.
Toss gently and serve as soon as possible, ideally within an hour or so of making.