Slice beef roast into stir-fry sized strips. Combine Worcestershire Sauce and cornstarch, enough to coat beef. Marinate beef in this mixture while you prepare the vegetables. Also add a little cornstarch to your beef bouillon (this will be your sauce.) Parboil carrots and squash.

Cook beef until brown. Add vegetables and stir fry until almost done. Add sauce mixture and continue to stir fry until sauce is thickened and vegetables are cooked. Serve over rice.