Boil the eggs for about 10 minutes, quench. Peel and chop onion. Dice cucumber. Wash chives, cut into rings. Peel and chop the eggs. Mix with onion, cucumber, capers, chives and crème fraîche.
Season to taste with salt and pepper.
Wash the salad and dab dry. Cover breads with lettuce, ham and egg-choppers. Grate cheese. Cut cress from the bed. Sprinkle both over it.