Wash the cucumber, bell peppers, and romaine lettuce thoroughly.
Slice the cucumber thinly. Remove the seeds from the bell peppers and cut them into bite-sized pieces.
Tear the romaine lettuce into bite-sized pieces.
Place the cucumber, bell peppers, and romaine lettuce in a bowl.
Drizzle dressing (olive oil, lemon juice, salt, pepper, etc.) and toss lightly.