Whatever works for you. I've done probably 30 big loins this way and I've never had an issue with drying out or over cooking. You're right on the fat content, but I was just stating what I have done, and I will say it has worked out very well.There is no reason to do this with pork loin. With pork butts, ribs, or other meats that are high in fat and need to get to higher temps you get some benefit as the meat will stay at a high enough temp to continue to render the fat for a while. Pork loin is lean, and there is no reason to let it rest any longer than you would a steak. In fact, I would think you would risk carry over cooking it too much and starting to dry it out.
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