Demi Glace sauce is a complicated sauce served traditionly with beef. It is made with 1/4 pt clear beef stock added to 1/2pt Espagnole sauce. Espagnole sauce is made by frying up chopped bac..on andshallot onion carrot and mushroom stalks until brown, stirring in flour and frying until brown, then tomato paste boquet garni seasoning and 1/2 pt beef stock are added and stirred in until thickened,then simmered very gently for an hour, Strain and skim off any fat. You would have to be very commited to go to all this effort!