In the large mixing bowl add the olive oil, and squeeze in the juice of 2 lemons (taking care not to drop in any of the seeds)
Chop each of the pointy ends of the watermelon off to make it easier to cut the watermelon into slices. Make sure you remove the white rind and get down to the flesh
Stand the watermelon on one of its cut ends so it is stable. Then Carve off the rind. Follow the contours of the watermelon with the knife to remove all the rind and expose the flesh
Cut 1 cm slices down the length of the watermelon. Save half of the slices and put them to one side, we won't be using them. With the remaining slices, lay them flat and gently slice 1 cm apart across the grain, making 1 cm cubes of Watermelon. Add to a large bowl (not the bowl you will be serving the salad in)
Cut the feta into similar 1 cm cubes and add to the watermelon in the bowl
Slice the tips off the cucumber, then slice them into 1cm or so cubes, then add to the watermelon and feta
Roughly chop the Basil and add to the bowl
Using your hands, gently toss the salad to get as much of the olive oil and lemon juice to coat the watermelon, feta and cucumber
Transfer to the serving bowl, then gently scatter with the broad beans and give it a light season with pepper to your taste
Enjoy now or pop covered in the fridge to eat later