Juicy watermelon, briny feta, sharp red onion, and bitter arugula might seem like an odd combination, but toss them together into this simple Summer salad, and you'll see why variations on this mix abound. The crisp sweetness of the watermelon is a wonderful counterpoint to the leafy, slightly bitter arugula, and the saltiness of the feta finds itself mellowed by the red onion's kick. Though this salad only has a handful of ingredients, each one plays an equal part in adding to the complexity of the dish. Arugula wilts quickly when wet, so hold off on the dressing until right before serving.
