Cut the steak into 1 inch cubes.
In a cast iron pot, brown cubed beef chuck or steak in oil over high heat to brown. Stir in the onion. Reduce heat to medium.
Cut the veal kidney into 1 inch cubes. Saute in oil over high heat. Transfer the kidneys to the beef. Add the tomato paste to the beef mixture. Add the cubes mushrooms, salt and pepper.
Mix the cold water with the Knorr demi glace mix or brown sauce mix. Stir into the beef mixture.
Simmer for 30 minutes over low heat, or until meat is tender.
Ladle the steak and kidney pie mix to an oven proof baking dish. Cool mixture.
Roll Never fail pie crust over the meat. Seal edges. Bake at 350 F until crust is brown.