roast beef

Let the beef come to room temperature for about an hour. In a frying pan without oil, cook each side of the beef for 30 to 1 minute, then sprinkle pepper all over

After removing the cooked beef, place it in a plastic bag, add [A], and then let the air out of the bag. (If you immerse the bag in water, the temperature difference will cause the air to escape. It is better to put your mouth over the opening of the bag and suck in the air inside.)

Put [2] into a styrofoam container, pour in hot water (boiling water with about 20% water added), cover and wait 15 minutes

After 15 minutes, remove the beef from the bag and pour the sauce into the frying pan. Cut the beef against the grain and arrange it flat on a plate

Heat the sauce in a frying pan and add water-dissolved potato starch to thicken it

Place the grated apple in the center of the plate, pour the sauce over it, and it's done