Source: Clare F., allrecipes.com
3/4 c. halved, thinly sliced red onion
1 T. fresh lime juice
1 1/2 qts. seeded, cubed watermelon
3/4 c. crumbled feta cheese
1/2 c. pitted black olive halves
1 c. chopped fresh mint
2 T. olive oil
Place the onion slices in a small bowl with the lime juice. The acid of the lime will mellow the flavor of the raw onion. Let stand 10 minutes.
In a large bowl, combine the watermelon cubes, feta cheese, black olives, onions with lime juice, and mint. Drizzle olive oil over it all, and toss to blend.
Optional: Serve in hollowed out watermelon shell.