I want to make a large batch of hamburger patties from frozen ground beef (thawed properly). My question is, can I partially cook then freeze?
Beef – Freezing partially cooked hamburger patties
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When you buy a burger from a fast food restaurant you are buying a product that has been engineered to provide absolute consistency, be very fast to cook, and be as cheap as possible so it can be offered at a low price for a reasonable profit. The grill marks are engineered in, and they are given coatings which will give the right appearance when cooked. They also have flavorings added so they taste as the designers (yes there are burger designers) intend. It's not a simple bunch of ground beef at all. Most frozen pre-made burger patties are similar, they use cheap cuts of beef (and sometimes reclaimed meat) and artificial ingredients to produce a consistent and inexpensive product. They also tend to be very thin and are easy to cook all the goodness out of by accident.
If you want a really good burger then you need good burger meat, it's as simple as that. You can't make a good burger out of low quality meat no matter what you put into it. The simplest way to make a good burger is to find a local source of good quality ground beef and make your own patties. Making patties is very easy and quick, just get your hands in there. Many supermarkets have perfectly good packaged products (I get mine from a local grocery store and it makes good burgers), so that would be my first port of call, next would be butcher shops.
If all else fails and you want to make your own (or just give it a try) then you're in luck because the best cuts for burgers are also the less expensive ones, like brisket, chuck, short rib, and round. Round has great flavor but is very lean, and working cuts like brisket and chuck are also lean, so you'll want to add some fat. Many burger nuts say you need 30% fat by weight, personally I'd aim for 20% as 30% is too much for my taste, but that's up to you.
As for frozen versus fresh, freezing does cause some loss of flavor, however it's not much. You are much better off with frozen good quality meat than fresh low quality.
I think a microwaved, reheated burger is probably not going to compare favorably to a freshly-cooked burger. With that said, I think the main thing for the pre-cooking is that it would need to be start off a little undercooked, otherwise the heating process is going to result in it being overcooked (since you're saying you're looking for some pink in the middle).
Other than that, I think the key is more in how you microwave it. Obviously, you want it to cook evenly. I'm assuming you're starting from refrigerator-cold. If you start from frozen it is going to have a lot more trouble heating evenly. Also, it might go without saying, but I'd cook the meat on its own (no bun or condiments).
Most microwaves tend to have hot spots in certain areas. There is a pretty interesting (IMO) blog post that demonstrates this using papadam (those crispy lentil crackers you get at many Indian restaurants). The ones tested in that experiment, seemed to mostly be good directly in the center of the tray, so that might be the best placement. If you want to be really super-scientific about it, you can try to replicate that method and figure out how to arrange your food in your microwave.
But if you don't have any papadam handy and you don't know what your office microwave is doing, you may want to find a supposedly-microwave-safe plate that still tends to get hot in the microwave and heat your burger on that. I think the plate is going to transfer heat more evenly to the burger than the microwave would. (On the other hand, I sometimes question whether dishes that get really super hot in the microwave are, indeed, as microwave-safe as they claim to be, so use caution....) Using a real plate, though, instead of a paper plate should help with the evenness of the heating.
I'd also suggest cooking it in short bursts (15s at a time) and letting it rest in between, or cooking it on low if your microwave has power settings (which just does the same intermittent power thing anyway).
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Best Answer
It would be possible to come up with a protocol to do this safely, however the more time that meat spends in the so-called thermal danger zone the more you need to thoroughly cook it at the end. It's hard to understand what you would be gaining by doing this.