By 'seasoning' it. You slather it with some type of cooking oil and that protects it from turning bright orange with rust. Cast iron is the material of choice

By 'seasoning' it. You slather it with some type of cooking oil and that protects it from turning bright orange with rust. Cast iron is the material of choice as it is cheaper than surgery grade stainless steel, it retains the heat and it is a traditional material that people expect. As for where you can buy yourself a grill made from cast iron, the options are many. In towns there are shops that sell such things. You can walk into such a shop, exchange money and get your own BBQ grill in genuine cast iron.