Finely dice the onion and garlic cloves, mix with mustard, vinegar, a little salt and pepper and fold in the oil.
Pluck the lettuce into smaller pieces, cut the celery and tomatoes into slices, and the peppers and anchovies into strips. Drain the tuna well and cut the eggs into sixths.
Mix the vegetables, olives, anchovies, tuna and the dressing well and arrange the eggs on top.