Wash the potatoes, boil, drain and peel them while they are still hot. Cut the lukewarm potatoes into thin slices. Fry the bacon cubes until brown and pour over the potato slices with the fat that has leaked out. Scatter onion cubes. Mix egg yolks with 3 tablespoons of stock. Heat the rest of the broth, whisk with oil, vinegar, salt and pepper. Mix the salad ingredients with it and fold in the egg yolks.