Peel and wash the potatoes and cook them in boiling salted water for about 20 minutes. Peel onions and cut them into slices except for one half. Chop the remaining half of the onion finely. Wash parsley and thyme, dab dry, pluck leaves from the stems and chop finely.
Knead minced meat, onions, herbs, except for some parsley, egg yolk and breadcrumbs and season with salt, pepper, paprika and mustard. Heat oil in a pan. Shape 3 minced talers and fry them in hot fat on both sides at medium heat for about 4 minutes.
Remove from the pan and keep warm. Brown the onion slices in the frying fat and deglaze with stock. Add tomato paste and stir in. Bring to the boil and braise at low heat for about 5 minutes.
Season to taste with paprika, salt and pepper. Arrange the minced meat, potatoes and sauce on a plate, sprinkle with remaining parsley and serve garnished with parsley as desired.