In a fry pan, melt butter, add shallots and cook until slightly golden. Add garlic and mushrooms, increase heat. Stir well and when they begin to stick add wine, then beef stock and
thyme. Boil until mushrooms are cooked and sauce is reduced slightly, about 5 minutes. Check seasonings and add salt and/or pepper if desired.
Cook steaks as desired (Broil or BBQ) and serve with sauce poured gently over top.