Celery and carrots peel, wash and cut into very fine sticks. Mix buttermilk and lemon juice. Season to taste with salt and pepper. Mix half of the marinade and vegetables.
Wash and drain the lettuce leaves and put them on the plates. Spread carrot-celery raw vegetables on top. Garnish with slices of celery and parsley. Add the remaining buttermilk marinade garnished with the grated lemon peel.