In alt.food.barbecue, Terry Caton wrote:
Surely I'm not the first person to wonder how sweet it would be to have a
heavy cast iron grill grate in a standard Weber kettle, instead of the
stock, light-weight stainless steel grate that has zero heat capacity.

I have a nice one made by Lodge. It is heavy cast iron, machined smooth.
It can hold a LOT of heat.

Google on Lodge LBBG3. Amazon has them.

--
The whole problem with the world is that fools and fanatics are always so
certain of themselves, but wiser people so full of doubts.
-- Bertrand Russel