Using a melon baller, prepare the melon into large balls. Set aside in a bowl until ready to serve.
About 30 minutes before you’re ready to serve, drain the liquid from the bowl (I poured it into a cup and drank it!).
Scatter half of the watermelon into a large, shallow serving bowl and scatter half of the arugula and feta on top, repeat with the remaining watermelon, arugula and feta then top everything with fresh mint.
