| Trim fat from meat and reserve. Cut meat diagonally across grain in very thin strips. Heat fat trimmings in skillet until you have about 3 tablespoons melted fat (add butter if necessary). Remove trimmings and discard. Brown meat. Add water and mushrooms with liquid. Stir in soup mix. Heat to boiling. Blend sour cream and flour. Add to hot mixture. Cook and stir until sauce thickens, it will be thin. Serve over noodles. | 
