Step 1

Place the red onion in a bowl and cover with water. Let soak while you prepare the other ingredients.

Step 2

To a large serving bowl, add the watermelon, edamame, mint, and drained red onion. In a small bowl or large measuring cup, whisk together the olive oil, lime juice, honey, salt, and pepper. Pour over the watermelon mixture and toss to coat. Add the avocado and feta and gently toss to incorporate. Refrigerate until ready to serve. The salad will likely have some excess liquid at the bottom from the watermelon, so I recommend serving it with a slotted spoon.