Wash the potatoes and cook in salted water for about 30 minutes. Drain, peel and let cool off. Dice bacon. Heat oil and fry bacon until crispy. Deglaze with vinegar and stock and season.
Put it in a bowl. Cut the potatoes into slices and add. Let stand for 30 minutes. Wash and clean the radishes. Peel cucumber. Cut both into slices. Wash chives and cut into small rolls.
Mix everything into the potatoes. Drain the corn, soak the rolls in water. Peel and chop the onions. Knead minced meat, eggs, mustard, corn, onions and squeezed out roll to a smooth dough.
Season with salt and pepper. Form meatballs from it. Grill for about 5 minutes on each side. Add potato salad.