Season the pork fillet with salt, pepper and paprika and wrap with the bacon slices.
Chop the onions and fry them in the roasting pan with fat. Remove the onions and set aside. Then briefly sear the pork fillet all around and add half of the broth and half of the red wine. Cook in the preheated oven at 130 ° C for about 25 minutes. After the cooking time, take the pork fillet out of the roaster and set aside. Heat the frying liquid again and bring to the boil with the rest of the red wine and stock. Add the onions again and season to taste. If necessary thicken with a sauce thickener.