You cooked the steak perfectly, then sliced it the second it left the pan and watched a puddle of juice run out onto the cutting board. That juice belonged in the meat, and resting is how you keep it there.
What resting actually does
While meat cooks, the heat drives moisture toward the cooler center and tightens the muscle fibers, squeezing the juices into the middle. If you cut in immediately, all that liquid pours out. Let the meat sit and the fibers relax, the temperature evens out, and the juices redistribute through the whole cut so they stay put when you slice.
How long
- A steak or a few chops need about five to ten minutes.
- A roast chicken wants fifteen minutes or so.
- A big roast or turkey can rest twenty to forty minutes and still be plenty hot.
Keep it warm, not covered tight
Tent the meat loosely with foil to hold heat without steaming the surface, which would soften any crust you worked for. Resting is not wasted time, it is part of cooking, and it also gives you a window to make a pan sauce or finish the sides. The meat keeps cooking a few degrees during the rest too, so pull it off the heat slightly before your target temperature.