When it comes to cooking brisket, one of the most critical steps is letting it rest after it's cooked. Once cooked, remove it from the heat, unwrap it from the foil or wax paper and leave the brisket on the cutting board to rest. Most people recommend letting the brisket rest for at least one hour, but I find that 1 hour and 30 minutes is ideal. Although it is best to let it rest unwrapped, you can just loosely cover it with foil.