Cut the pork tenderloin into medallions. Season with salt, pepper, paprika powder and then wrap with the bacon. Place in a baking dish and set aside for now.
Steam the onion cubes in a pan until they are nice and translucent, deglaze with a dash of white wine vinegar and simmer a little. Add the beaker of sour cream and the coarse, grainy mustard and season with a pinch of sugar, salt and pepper. Pour the onion and mustard mixture over the pork medallions and cook in the preheated oven at medium heat (170 ° C) for about 30 minutes.