Wash and hull the strawberries, then slice them into quarters.

Peel and thinly slice the cucumber into uniform pieces.

If using, thinly slice the red onion.

Cut the watermelon into bite-sized cubes.

In a large mixing bowl, gently combine the strawberries, cucumbers, watermelon, and red onion if using.

Fold the ingredients together with a rubber spatula to mix evenly.

In a small bowl, whisk together the olive oil, lime juice, salt, and pepper.

Pour the dressing over the salad and toss to coat.

Chill for at least 30 minutes before serving for best flavor.