Boil the potatoes as usual as jacket potatoes and then peel them. Cut into slices while still warm. Put in a bowl and keep warm in a hot water bath. Pour vinegar and meat stock over them.
Peel and finely chop the onion, pour over the potatoes. Dice the bacon. Heat the oil in a pan and fry the bacon until golden brown. Season with salt, pepper and sugar. Then pour the hot bacon sauce over the potatoes. Mix gently. Let the lettuce soak in a hot water bath for about 20 minutes.
In the meantime, wash, pat dry and chop the herbs. Sprinkle over the salad before serving.