The instruction to rest meat after cooking appears in virtually every recipe but is rarely explained with precision. López-Alt's testing identified both the mechanism and the correct resting time — overturning the common instruction to "rest as long as you cooked it" as imprecise and sometimes counterproductive.
A period of no-heat exposure after cooking that allows protein fibres to relax and reabsorb moisture that was pushed toward the centre of the protein by the heat gradient during cooking. Cutting immediately after cooking causes this moisture to flow freely out of the relaxed fibres; resting allows the fibres to reabsorb it.
- The mechanism: heat causes protein fibres to contract and squeeze moisture toward the centre of the protein. As the meat cools, the fibres relax and the moisture is reabsorbed — but only if given time - Resting on a wire rack (not a plate) prevents the bottom surface from steaming in its own moisture, which softens crusts and continues cooking the exterior - Tenting with foil traps steam and softens crispy skin — for crispy-skin preparations, rest uncovered - Resting times by cut: [VERIFY all] - Thin cuts (steak under 2cm, chicken breast): 5 minutes - Medium cuts (thick steak, pork chop): 10 minutes - Large roasts (whole chicken, leg of lamb): 20–30 minutes - Very large roasts (whole turkey, standing rib): 45–60 minutes - Temperature continues to rise during rest (carryover cooking) — typically 3–8°C depending on mass and heat applied [VERIFY] Decisive moment: Cutting test — a properly rested piece of meat, when cut, releases very little liquid onto the cutting board. An under-rested piece releases a pool of juice immediately. The juice on the board is juice lost from the serving portion.
THE FOOD LAB (continued) + THE DUCHESS BAKE BOOK