Cut the pork tenderloin into strips. Heat clarified butter in a pan and fry the meat in portions, remove and keep warm.
Peel and chop the onions and fry them in the frying fat until translucent. Clean and slice the mushrooms, add to the onions, fry and season with salt and pepper. Dust the flour over it and toast everything briefly. Deglaze with white wine, bring everything to the boil briefly. Add the cream and simmer the sauce until creamy. Season to taste, put the meat back in and serve.