Clean and wash the lettuce, bell pepper and tomatoes. Pluck the lettuce into bite-sized pieces. Cut the bell pepper into strips and cut the tomatoes into eighths. Drain the tuna and corn.
Drain the feta, catching the oil. 8 tablespoon. Mix with vinegar, a little salt, pepper and sugar. Peel and finely dice the onion.
Rinse the basil, shake dry, chop the leaves. Mix both with the sauce.
Mix all ingredients carefully, place in a salad bowl and garnish with pepperoni and olives.