If you don’t, the center will bulge when cooking. It is still tasty but it is easier to add toppings if flat. When freezing hamburger patties or any meat mixture, I prefer to use a food saver. It keeps it moist and it freezes well up to 2 months. Then https://burger-bestellen43197.dreamyblogs.com/21756750/die-burger-patties-kaufen-tagebücher