Tips & Tricks: The Importance of a Lid
A grill with a lid is not essential but it certainly helps and if you do not have a lid, maybe improvise with an upturned grill pan. Particularly when you have moved food to the edge of the fire.
A lid importantly not only keeps heat in, but it keeps flavour in. All the smoke and vapourised juices from your steak, burger or vegetable. It helps keep flare ups from happening.