Watermelon Salad with Red Onion and Black Olives

Cut watermelon flesh into 1 1/2-inch chunks; remove seeds. Toss watermelon with onion, olives, and cilantro to combine.

Drizzle olive oil and vinegar over salad and sprinkle with salt and pepper. Toss and adjust seasonings with more oil, vinegar, salt, or pepper as desired. Serve immediately.