Kettle BBQs, specifically, Weber BBQ grills were originally created by George Stephen in the 50’s.
He part owned the Weber Brothers Metal Works in Chicago who made, among other things, buoys used in Lake Michigan – hence the roughly spheroid design.
Description and Use
It is composed of a lid, the lower chamber contains the cooking grid, charcoal grid, and venting system, and all on legs.
Some models include an ash catcher pan and wheels.
The lower chamber that holds the charcoal is shaped like a kettle (sort of), giving the grill its generic name.
The kettle design distributes heat more evenly than an open grill – which only cooks the area immediately above the coals.
When the lid is placed on the grill, it prevents flare-ups from dripping grease, and allows heat to circulate around the food as it cooks.
The venting system consists of one or more vents in the bottom of the lower chamber and one or more vents in the top of the lid.
Normally, the lower vents are to be left open until cooking is complete, and the vents in the lid are adjusted to control airflow. Restricted airflow means lower cooking temperature and slower burning of charcoal
this means Weber grills and indeed most kettle grills can be adapted for
Indirect grilling.
or even BBQ smoking - the aroma from smoking wood is held in by the lid allowing it to flavor the food.
Food, such as a whole chicken, is then placed inside over a water pan, into which the juices drip - rather than onto the coals and cause flames.
(This following video gives a lot of detail on using a Weber kettle grill)
Conclusion
They’re particularly good for roasting joints of meat, whole chickens or even a Thanks-giving turkey, as the lid creates an effect similar to an oven - in fact they make a passable
tandoor oven.
Obviously all the usual grill fayre like burgers and corn on the cob, etc can be grilled without the lid.
The lid also makes them rain proof – which is handy, depending on your local climate.
The Weber has become something of a design icon over the years, and comes in various sizes, configurations (portable, wheeled or not) and funky colours.
Also they are practically indestructible, lasting many years, especially if you have a cover over yours. Certainly if I was starting up as a barbecuer again, I would consider buying a Weber grill first.