1: Cut the watermelon into cubes.
2: Crumble the feta cheese.
3: Chop the mint leaves and green chilies.
4: Slice the red onions thinly.
5: In a bowl, combine the watermelon, feta cheese, mint, green chilies, and red onions.
6: Add sugar if needed, and mix well.
7: Serve chilled.
