Wash and squeeze the limes, you need about 3 tablespoons of juice.
Remove the peel and thinly slice the red onion, cut slices in half or quarters.
In a small bowl, add the sliced onion to the lime juice and marinate.
Slice watermelon into 1-inch thick pieces, cut into triangles and remove rind and pits, chop into 1 to 1 1/2 inch pieces.
Wash and cut the cucumber into 4 pieces lengthwise and chop these into bite-sized pieces.
Chop or break Feta into bite-size pieces
Tear or chop parsley and mint leaves into nice sized pieces, not too small.
Combine the above ingredients in a large bowl.
Pour the onions and lime juice marinade over the salad and toss.
Add a pinch of salt and a generous grinding of pepper.
Taste, and adjust salad ingredients to suit your taste, or add more lime, salt, and pepper if needed.
Enjoy this beautiful salad with people you love, or as a treat for yourself.