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Cast iron grids are the preferred grid for creating the grilled checkerboard pattern found at popular steakhouses. Perfect for steaks, burgers and fish, you can grill just about thing on cast iron.
What makes cast iron ideal for searing is its ability to absorb and release large amounts of heat. The grid is dual surface: narrow side for grill marks and wider side for deeper blackening.
To prevent rust coat the cast iron with a very thin film of oil after each cook. Try this: clean the grid with a brush, spray lightly with PAM or similar and then return the grid to the hot grill (place up in the dome) where it can cool/reseason as the grill cools down.