Rinse the lettuce, spin dry and tear into bite-sized pieces. Rinse tomatoes and cut into eighths. Peel and cube the cucumber. Peel the onion and cut into rings.
Mix together the oil, vinegar, salt and pepper to make a dressing and drizzle over the salad. Sprinkle the crumbled feta cheese and olives on top. Sprinkle with dried herbs to taste.