Cut steak into 4 ounce pieces. Heat oil in a skillet. Brown steak on both sides.
Place steak in roasting pan.
Sauté onions and garlic in fat where meat was browned. Add flour and brown slightly.
Add hot stock and puree, whipping constantly with wire whip to make a smooth sauce.
Season with salt and pepper. Pour sauce over steak in roasting pan.
Cover and bake
at 350 degrees F for approximately 2 hours or until steak is tender.