Wash the potatoes and cook for about 20 minutes. Quench, peel and let cool. Then cut into slices. Dissolve stock in 1/8 l boiling water. Pour over the potatoes and leave to stand for about 1 hour
Wash, peel and slice the cucumber. Wash and quarter the tomatoes. Wash and chop the chives. Mix with vinegar, mustard, salt, pepper and 4 tablespoons of oil. Mix with potatoes and vegetables. Leave to stand for about 30 minutes. Season to taste
Chop the schnitzel slightly flattened, dab dry. Season with salt and pepper. Whisk the egg. Turn the schnitzel first in the flour, then in the egg and finally in the breadcrumbs. Fry in 2 tablespoons of hot oil on each side for 3-4 minutes. Arrange everything with lemon and capers
Drink: cool white wine