Put eggs in boiling water, cook for about 9 minutes, drain, quench and peel. Wash the chives, shake dry, put some stalks aside for garnishing and cut the remaining chives into fine rolls.
Peel and finely chop the garlic. Mix mayonnaise and yoghurt. Stir in garlic. Season to taste with salt, pepper and sugar. Cut 1 egg into slices to garnish. Coarsely chop the remaining eggs.
Fold chives, except for 1 teaspoon, eggs and crayfish tails into the salad cream. Season again with salt, pepper and sugar. Clean and wash the lettuce, remove the outer leaves and use it for other purposes.
Wash the heart leaves and shake dry. Fill lettuce leaves into small bowls, distribute lettuce in them, decorate with egg wedges, chive stalks and chives.