1: Place watermelon chunks in a large bowl and set aside.
2: To make the dressing, whisk together olive oil, lime juice, and sugar in a bowl. Season dressing with Kosher salt and black pepper.
3: Pour the dressing over the watermelon.
4: Add cubed feta and toss lightly to combine.
5: Top with lime zest, mint, pistachios, and flaky sea salt.
6: Chill and serve.
