Coat a 9-by-13-inch baking dish with butter, and set aside. Heat the bone marrow over medium-high heat until liquefied, about 2 minutes. Add the mushrooms, onion, garlic, and celery, and sauté in ...

The sauce is made with a dry Bordeaux red wine, bone marrow, garlic and shallots for a rich, savoury flavour. Heat the oil in a large saucepan over a medium-high heat. Add the shallots ...