Begin by selecting a small, ripe watermelon that feels heavy for its size. Slice off the rind and cut the watermelon into bite-sized cubes or wedges.

In a small bowl, whisk together olive oil, lime zest, and lime juice until well combined. If desired, add sugar and whisk until dissolved.

Pour the dressing over the watermelon pieces and gently toss to coat each piece in the dressing.

Tear fresh mint leaves and fold them into the salad mixture. Season with kosher salt and black pepper.

Transfer the salad to a serving platter and sprinkle flaky sea salt on top before serving.