How long / to what temperature should I let meat rest?

It has been made abundantly clear to me that I should let meat rest after it has been cooked.
Once the meat is resting should I time the duration of the rest or measure the temperature of the cooling meat? And why?
Best Answer
The resting period is not generally done by an absolute temperature—you would have measured for (near) your target temperature before before taking the piece out of the oven or off the griddle or whatever.
Traditionally, it should be proportional to the size of the cut or roast.
- 5-10 minutes is good for a steak or individual chicken pieces, depending on their thickness
- Medium size roasts and smaller poultry, say 10-15 minutes
- Large roasts and large poultry (like a turkey), up to 30 minutes.
If you do want to measure by temperature for more precise results, Kenji Alt of Serious Eats recommends based on practical experimentation, for steaks:
Ideally, no matter how well-done you've cooked your meat, you want to allow it to cool down until the very center has reached 120°F (49°C). At this stage, the muscle fibers have relaxed enough that you should have no problem with losing juices.
He also reviews some of the science, and various explanations for why the resting works.
Cook's Illustrated's Americas Test Kitchen performed an experiment with several roasted pork loins, cutting them with no resting, or resting of 10, 20, 30, and 40 minutes. They found that even a 10 minute rest cut down on juices expressed by 60% compared to the unrested roast. They found far less difference in the roasts that were rested for longer periods, although there was continued improvement in the juice retention. They summarize (original emphasis):
So what to do? Curb your enthusiasm and let your meat rest. But not for too long. The most dramatic decrease in moisture loss for these pork loins took place during the first 10 minutes of rest. Additional time helps—but not if that means your dinner will be cold. If you’re cooking a big roast, you can wait longer—about 30 minutes. Thin steaks should only wait 5 to 10 minutes before you dig in.
This shows that the traditional advise on resting times is actually fairly effective.
Note: Thanks to Jefromi for sharing this reference.
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Quick Answer about "How long / to what temperature should I let meat rest?"
You could rest it for 5 minutes for every inch of thickness. You could rest it for 10 minutes for every pound. You could rest the meat for half as long as it took to cook. If the meat is thicker, you may rest it for the whole time it took to cook.At what temperature should you let meat rest?
Ideally, no matter how well-done you've cooked your meat, you want to allow it to cool down until the very center has reached 120\xb0F (49\xb0C). At this stage, the muscle fibers have relaxed enough that you should have no problem with losing juices.How long do you let meat rest after cooking?
Regardless of whether you're using a bone-in or boneless cut, Mar says that you should let the meat rest for half the time that it cooked for: "If it took 20 minutes to cook a rib-eye, it should rest for 10 minutes." This rule doesn't just apply to red meat though; from pork chops to poultry, all meat should rest once ...How long should meat rest before?
It's important to bring the meat out of the fridge before cooking so that it gets closer to room temperature as this affects how it is cooked. I take the steaks out of the fridge up to one hour before cooking, so when they're cooked, the outside of the meat does not burn and the inside isn't cold.Can you rest meat for too long?
You can rest a steak for too long. If it's too tightly covered for too long, you can overcook it and dry it out. Other than that, the main risk is that your steak will get cold. It's always better to let it rest too little than too much, as losing some juice is better than eating a cold steak.How and Why to Rest a Steak
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
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