What do a roast leg of lamb, braised beef brisket, and broiled chicken thighs all have in common, besides that a vegetarian won't go near them? They all need to rest after cooking, unless you relish tucking into dry, stringy meat. The why is a little complicated, but basically, if you cut into a piece of meat right after pulling it from the heat source it'll expel much more of its flavorful juices onto the cutting board (not into your mouth) than if you allow it to rest five to 30 minutes, depending on the cut.
The specifics: