Begin by rinsing your watermelon, strawberries, and cucumber under cool running water. Pat them dry gently with a clean towel.

Dice the watermelon into bite-sized cubes, slice the strawberries, and chop the cucumber into thick slices or quarters.

In a small bowl, combine fresh lemon juice, olive oil, salt, and pepper. Whisk until emulsified.

In a large salad bowl, mix the diced watermelon, sliced strawberries, cucumber, and crumbled feta cheese.

Drizzle the lemon vinaigrette over the salad and toss lightly until well coated.

Optional: Sprinkle fresh mint leaves over the salad before serving.