Peel, wash and quarter 2 onions and carrot. Wash the meat and pat dry. Season with salt and pepper except for the rind, rub with mustard. Roast everything in the greased flat roaster in a hot oven (electric cooker: 200 °C/recirculating air: 175 °C/gas: level 3) for approx. 1 1/4 hours. Add broth little by little
Wash the potatoes and cook for about 20 minutes. Quench, peel. Clean, wash and drain the spinach. Peel 5 onions, cut into slices
After about 1 hour, brush the roast with salted water. Fry potatoes in 1-2 tbsp. hot oil until golden brown all around. Season with salt. Fry onions in a pot in 1 tbsp. hot oil. Add spinach, cover and steam for about 5 minutes. Stir in cream. Season to taste
Remove the roast. Pass the roast stock and vegetables through a sieve. Bring to the boil. Mix flour and 2 tablespoons of water and thicken the stock. Season to taste. Arrange everything