Tear the lettuce leaves by hand and put them in a salad bowl.
Cut the cucumber into thin strips.
Cut the bell pepper into thin strips.
Put the cucumbers and peppers in a salad bowl, on top of the chopped leaves.
Cut the tomato in half, then cut it into thin slices.
Put the tomatoes in a salad bowl with the rest of the vegetables.
Grate the cheese on a coarse grater, add it to the vegetables and mix gently. Drizzle with lemon juice and season with olive oil. If the cheese is salty enough, there is no need to salt the salad. If desired, you can add grapefruit and sesame seed.