1 Turn your oven to medium. 2 Place some large mushrooms in a baking dish, season well, pour a little beef stock over them and a tablespoon of butter or oil. 3 Bake in the oven for a good 15 minutes. 4 Heat your frypan to cook the T-Bone. Add a little oil and cook one side first. Turn only once, seasoning the cooked side well. When cooked to your liking, remove from the pan and place it with the mushrooms in the oven. Turn the oven to low. 5 To make the sauce, drain the juices from the mush-rooms into the pan in which you cooked the steak. Put this back on the heat and if needed add a bit more beef stock. Reduce this liquid until you have a nice coating.