2 lbs beef stew meat 1/2 cup flour 1/2 cup oil 2 thinly sliced onions 2 tablespoons demi glace (or the commercial products Marmite or Bovril) 2 bottles of dark beer 8 - 10 rounds of stale French bread 1/2 cup Creole mustard Salt and pepper to taste 4 Idaho potatoes, cut into 1/2 inch cubes and parboiled until tender