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https://www.napoleon.com/en/ca/barbecues/discover/features/wave-cooking-grids
Our cast iron cooking grids are coated in a porcelain enamel that, when properly maintained, will season up just like a cast-iron frying pan. While they do take a while to preheat, it is well worth the wait. The sear from a cast iron cooking grid is unparalleled. Heat is retained and transferred easily through cast iron. Your grids will stay hotter for longer whether you are using gas or charcoal.