Tear the lettuce leaves into bite-sized pieces and transfer them to a large salad bowl. Add the cucumber, tomatoes, and onion. Sprinkle with the oil, vinegar, and salt and pepper, and toss to combine.
Tear the lettuce leaves into bite-sized pieces and transfer them to a large salad bowl. Add the cucumber, tomatoes, and onion. Sprinkle with the oil, vinegar, and salt and pepper, and toss to combine.
