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Can anyone elaborate on why low & slow results are different from high & fast cooking?

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    #16
    Still awake?

    The genius of the reverse sear

    Now here’s where things get interesting. If you cook a thick steak over IR you can get a gorgeous dark Maillard crust. As it continues to warm, the layer below turns brown, the layer below that turns tan, the layer below that turns pink, and finally, in the center you get a layer that is perfect medium rare. Most of the meat is overcooked and the exterior may well be burned. I call it the rainbow effect.

    But if you put the steak in the indirect convection zone at about 225°F with the lid down the energy transfer goes slowly and more evenly. At low temperatures energy has time to swim all the way to the center without overcooking the surface. The temperature can be close to the same bumper to bumper. Prof. Blonder says “It’s like watering a potted plant. Sprinkle too fast and the pot overflows before the water can seep in. Sprinkle slowly and all the soil is moistened.”

    Called reverse sear because we sear at the end rather than the beginning, it works best on thick cuts, more than 1-inch thick. Start a steak on the indirect side at about 225°F with the lid down so it warms gently and evenly from all sides. Then, when the center gets 10 to 15°F below your target temperature, let’s say target is 130°F, when it hits 120°F, take it out of the heat for about 10 minutes so the surface can cool a bit. Don’t worry, the inside will stay warm. But this cooling allows you to sear a bit longer without pushing too much heat into the core. Then move it over direct scorching infrared at Warp 10 and lift the lid so all the energy is pounding only one side. Because the lid is up, the top side is cooler and energy isn’t trying to overcook it from above. Then flip it and pummel the other side with IR and let the energy that has built up on the side that was facing the fire a minute ago bleed off into the cooler air rather than migrate to the center. And in defiance of tradition, we flip the steak every minute or two. Reverse sear. It is an important foundational method outdoors and indoors.

    How many cookouts have you gone to where the chicken skin was charred and the meat was close to raw in the center? Because poultry skin has a lot of fat in it, direct IR can wreak havoc with it. Chickens are best cooked with indirect convection airflow most of the process, and then, when they are almost done, you can move them over IR with the lid up for just a few minutes, watching carefully, to crisp the skin.

    I use reverse sear for everything from huge prime rib roasts to baked potatoes (they are optimum at 208 to 210°F). The only time it doesn’t work is on thin foods like skirt steak and many vegetables.

    Reverse sear is perfect for pellet cookers. Because most are built like your indoor oven with a metal plate between the flame and the food, they rarely produce enough IR to get a good sear. So when I want that scrumptious smoked pork chop with a killer sear, I fire up my pellet cooker at 225°F and put a cast iron pan in there. The meat doesn’t go in the pan yet, it bathes in the warm convection air at first. When the meat hits 120°F on the interior I put a thin layer of oil in the pan (bacon fat anyone?), open the lid, plop the meat in the pan, press it hard against the hot metal, let conduction sear it, flip, and pull it off in the 135 to 140°F range.

    For thin cuts

    I love fajitas al carbon, fajitas cooked over charcoal. They are usually made with skirt steak, a thin flap of tasty hardworking muscle from the underside of beeves. There are two cuts of skirt, inside and outside, and outside is a bit thicker and my preference. The problem is that they are both so thin that they can be well done long before the exterior gets some nice Maillard flavor. Especially if you marinate it because that makes the surface wet and the first few minutes of cooking are wasted evaporating the water which cools the meat and retards the cooking. Yes, you can pat the meat dry, but then you are removing most of the marinade.

    For thin cuts like skirt steak, skinny pork chops, or shrimp, reverse sear doesn’t work well. There are four good solutions.

    Sear one side only. Cook it for only a minute on one side, just to take the rawness out. Then flip it and crank it to Warp 10 until it gets a dark sear. It will have a great crust on one side, be tan on the other, and remain rosy or pink in the center.

    Cook frozen meat. Yes, you heard me. Get it frozen in the center and then sear it over Warp 10 on both sides. By the time the exterior is a beautiful dark brown, the interior has thawed and risen to optimum temperature. This also works if you marinate the meat. Skirt is a good cut to marinate because the striations in the grain have nice grooves for the marinade to nestle into, and because the meat is so thin, even if the penetration is shallow it is still a large percentage of the thickness. But the problem with wet meat is that it must dry out before it can brown. If you marinate skirt for a few hours and then freeze it, then grill it over rip snorting high heat, the surface can dry and brown before the frozen center turns grey.

    The afterburner. The afterburner is the name I’ve given to searing on top of a charcoal chimney as described on page 000.

    Torching. You can get a decent shallow sear with a propane torch as described on page 000. It runs at about 2,000°F. The problem is that it can burn the meat in a hurry and because you have to keep it moving the sear tends to be shallow.

    Comment


      #17
      MYTH. Flip only once.

      BUSTED. For years we have been told to flip only once and many cookbooks still perpetuate the myth. They tell you to leave the meat alone. But this defies physics.

      When searing a steak with infrared on a grill or conduction in a pan or griddle the energy comes from a single source, below. Just as if you are lying on the beach in the sun, the side facing the sun collects energy, darkens, and cooks much faster than the other sides. So you need to flip or burn.

      When you flip meat the surface that faced the flame now faces up but some of the energy stored in that surface continues to move gently down into the meat and some of the energy dissipates into the relatively cooler air. Leave it alone and you get the rainbow effect. Flip often and you don’t. Be the human rotisserie.

      Flipping often also cooks the meat faster because heat is now entering the meat from more than one side at a time. Food scientist Harold McGee first explained the phenomenon in Physics Today in November 1999. J. Kenji López-Alt and I jumped on the bandwagon soon after, and Prof. Blonder ran experiments that proved the theory in 2016. He proved the meat cooks 20 to 30% faster by flipping often. In March 2022 Jean-Luc Thiffeault, a Professor of Applied Mathematics at the University of Wisconsin published an equation-filled 12-page paper in the peer reviewed journal Physica D titled “The mathematics of burger flipping.” His conclusion: Flip often.

      How often is often? I say once a minute is too fast to build a dark crust. Every 2 to 3 minutes will do the trick. The result is a steak with more evenly cooked meat done sooner. A word of caution, frequent flipping is not recommended for fish. It just falls apart.​

      Comment


        #18
        Originally posted by Meathead View Post
        In March 2022 Jean-Luc Thiffeault, a Professor of Applied Mathematics at the University of Wisconsin published an equation-filled 12-page paper in the peer reviewed journal Physica D titled “The mathematics of burger flipping.” His conclusion: Flip often.​
        As someone at a university, I like to say, "What do we study? Well, we study everything." You have now given me my newest favorite example.

        (Yall...here's a link to the PDF: https://arxiv.org/pdf/2206.13900)

        Click image for larger version

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          #19
          Great stuff as always Meathead .

          Comment


            #20
            Excerpt from Thiffeault's paper
            Attached Files

            Comment


            • yakima
              yakima commented
              Editing a comment
              But, no consideration of the coefficient of arthritis friction,

            • MBMorgan
              MBMorgan commented
              Editing a comment
              Unfortunately, the excerpt provides insufficient context to be useful. Thankfully, Michael_in_TX provided a link ( https://arxiv.org/pdf/2206.13900 ) to the whole story.

            • yakima
              yakima commented
              Editing a comment
              I initially thought this must be dated April 1. But the prof and this paper exist, together with many other papers. Time for fzxdoc to weigh in, perhaps to compare PBC hang times with burger flipping variants!

            #21
            Man, this is solid gold!!!

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              #22
              Meathead Tremendous explanation extending from simple to physics with math.

              Comment


                #23
                Lars Axelsen If you have never had slightly pink pork tenderloin, you have never had pork. The old rules about cooking to 170 were written when Trichinosis was a problem from pigs eating trash. Modern pigs are clean and there hasn't been a case of trich in pork in a decade or more (last cases were from bear meat). USDA lowered their recommended temp to 145 years ago. But I am here to tell you 135 to is a marvelous eating experience and it is perfectly safe. That's the same temp you cook steaks to and they are safe. Overcome your fear and have some fun!

                Fellow members, tell him about your experiences with pink pork!

                Comment


                • Lars Axelsen
                  Lars Axelsen commented
                  Editing a comment
                  Meathead - I know that slightly pink pork is safe to eat - but habits are hard to change, even when using sous vide and reverse sear in the past, where beef is perfectly cooked yet still looks too rare for my taste when only cooked at 130F/54C rather than medium or medium-done (I usually go for 135F/57C. Will test the lower temp for pork and also do a fixed core temp comparison of low-slow vs high-fast for juiciness.

                #24
                I reverse seared this pork chop to 138°F (was aiming for 135°F), and the wife and I both thought it was amazing. My mom was raised on a farm, and she always cooked meat to well done. Check out the "juice-alanche”, as my man Ry would say.
                Click image for larger version  Name:	IMG_3202.jpg Views:	0 Size:	3.03 MB ID:	1591058
                Last edited by Sid P; April 29, 2024, 06:45 AM.

                Comment


                • RonB
                  RonB commented
                  Editing a comment
                  Lookin' good. Both my parents were raised on farms and ate everything well done - including veggies. I didn't care for steak until I was served a steak cooked to medium instead of well done and decided to taste it before sending it back. Been enjoying steaks ever since.

                #25
                The first time I reverse-seared boneless pork chops for my son-in-law, ending with a temp of 135° (during the sear) so carryover would get it to 140°, he put his fork down after the first bite and said he didn't know whether to cry or jump for joy. He had always loved pork chops, but all the home-cooked ones he had growing up were dry, dry dry. He couldn't believe such meat juices existed in pork.

                Each time I make them, (still the same way), he says "You haven't lost your touch."

                Kathryn
                Last edited by fzxdoc; April 30, 2024, 06:29 AM.

                Comment


                  #26
                  Great explanations, Meathead . Thanks. They make me wish your next book would come out sooner than later, but take your time. Attention to detail, as you do, is what makes a good book a great one.

                  Kathryn

                  Comment


                    #27
                    Mrs doesn’t care for pork chops, and if I cooked one for her to 135° or even 145° she would probably cut it into squares and microwave them.

                    So I’ll make myself a chop and her a steak. Or, more likely, whenever a favorite restaurant had pork as a special I get it, and I’m not usually disappointed.

                    Comment


                      #28
                      I don't go quite as low as Meathead recommends, but I Sous Vide thick pork chops, especially the double cut at 140* for 2-3 hours, then sear. The IT usually gets to around 145* that way. The pink is gone, but they are still very tender and juicy. Going over 160* makes them dirt dry, at least to our palates. I don't do the thin cuts anymore, so no recent experience to suggest with those. Honey-mustard glaze is our favorite for pork, even tenderloins.
                      Last edited by GolfGeezer; April 30, 2024, 07:07 AM.

                      Comment


                        #29
                        We don't eat pink pork.
                        Or medium-rare beef, for that matter.

                        Comment

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