1. put onion, carrot, wine, celery, bouquet, leek garni, salt, pepper and 500 ml of cold water in a saucepan and boil. Simmer on low heat for 5 min, then pour in the crayfish, cover and do 5 min until they are reddish. Drain and cool.
Set aside four whole crabs for garnish. Shell the remaining crabs: twist off the head and peel off the tail shell. Divide the lettuce leaves evenly among four plates and top with the crabs. Place one whole crab on the edge of each plate….
3. dressing: spread the strawberries through a sieve into a large enough bowl. Add oil, mustard, juice of one lemon, salt and pepper and mix well. Spread evenly over the lettuce.