- Heat veal stock in a pan over high heat until reduced by three-quarters, about 15 minutes. Set aside.
- Heat butter in a pan over high heat and fry mushrooms, garlic and parsley until mushrooms are browned.
- Add reduced veal stock and let simmer for 15 minutes over medium heat. Salt and pepper to taste.
- Cook beef prime rib to desired doneness and serve with panfried mushrooms.
Health info: Low in calories due to their low level of carbohydrates and lipids, mushrooms are rich in potassium and vitamin B2.