Boil 4 eggs in boiling water for 8-10 minutes until hard. Peel and wash the potatoes, cut them into pieces and cook them in boiling salted water for 15-20 minutes.
In the meantime, knead the minced meat, mustard, breadcrumbs and 1 egg to a smooth mixture. Season with salt and pepper. Rinse the eggs cold and peel them. Divide the minced mass into 4 portions, form into balls and fill with prepared eggs.
Heat 4 tablespoons of oil in a large frying pan. Fry the egg and meatballs over medium heat for 10-12 minutes, turning them over.
Heat 1 tablespoon of oil in a second pan. Leave the bacon in it while turning it until crispy. Take out and drain on kitchen paper. Melt butter in a saucepan. Stir in flour and sauté briefly.
Add the stock and milk while stirring. Bring to the boil, boil for about 5 minutes, season with salt and pepper. Drain the potatoes and add to the sauce.
Wash, clean and slice the tomatoes. Peel onion and cut into small cubes. Mix vinegar and honey. Stir in olive oil drop by drop. Season to taste with salt and pepper. Mix tomatoes, onions and vinaigrette.
Crumble the bacon slices as desired. Cut cress from the bed. Cut the meatballs in half and arrange on plates with the potatoes. Sprinkle cress and bacon on top. Add tomato salad.