Wash the potatoes and cook in salted water for about 20 minutes. Then rinse with cold water and remove the skin. Let it rest a little. In the meantime clean, wash and quarter the radishes.
Also clean, wash and cut the romaine lettuce into fine strips. Wash the herbs and dab dry. Finely chop 2 stalks of dill and parsley. Cut 1/2 pot of chives into fine rolls.
Cut the potatoes into slices. Season vinegar with salt and pepper and heat in a pot. Stir in 1 tablespoon of oil and pour over the potatoes while still hot. Fold in remaining prepared ingredients.
Cover and leave to soak for at least 1/2 hour. In the meantime, purée the remaining herbs, except for 1 bunch for garnishing, and the remaining oil. Season with salt and pepper. Season salad to taste again.
Serve garnished with herbs. Serve with herb sauce.