Cut the watermelon in half, put it on a cutting board, cut side down, and cut off the rind and the white flesh with a sharp knife.
Next, cut the watermelon into 1-inch (2 cm) slices, then each slice into 1-inch (2 cm) sticks, then into bite-size cubes.
Transfer the watermelon cubes into a large bowl or serving platter.Add 1 tablespoon extra virgin olive oil, 2 tablespoons lemon juice, 1 handful mint leaves (finely sliced), ½ teaspoon salt, and ¼ teaspoon black pepper.Toss to combine.
Finally, garnish with 2 ounces feta (crumbled), 2 tablespoons lemon peel (finely chopped), 2 tablespoons pistachio nuts (chopped), and more mint.Serve immediately and enjoy with a spoon so that you can pick up the delicious juices.