Note for Muggles: I recommend using store bought/premade mashed potatoes - the kind that you can find near the prepared foods in your meat department. I used Bob Evan's garlic mashed potatoes. Cook the mashed potatoes according to the instructions on the box then stir in 2 tablespoons of butter until it has completely melted. Set aside and cool to room temperature.
Keyword ground beef, Harry Potter, lamb, potatoes, veal