How to Season Cast Iron Cooking Grates (Grids)
- Wash with liquid dish soap
- Dry right away with a towel (do not let it drain dry or wash in the dishwasher).
- Spread a thin coat of solid vegetable shortening or oil over the entire surface with a paper towel (do not use salted fats such as butter)
- Preheat BBQ grill (with grates removed) for 10 minutes with all burners on HIGH and the lid closed
- Open the lid and turn the control knobs to OFF,
- Now place grates on the grill (use CAUTION as the surfaces are very hot)
- Re-light the grill and turn control knobs to MEDIUM-LOW, close the lid, and allow the grill to heat grates for 45 minutes to 1 hour.
- Turn off all burners and leave cooking grates on the grill until they cool.
To prevent rusting, grates should be re-seasoned frequently; new grates should be re-seasoned after each use. If rust is present please brush it off with a wire brush.
IMPORTANT: Do not do a burn-off after you grill. Rather, leave the cooking residues on the grates and spread a coat of cooking oil on the grates, then do a burn-off just before you use your grill the next time. Then brush off charred residues with a steel brush before cooking.
When storing grates for an extended period of time, coat them with a thin coat of vegetable shortening, and keep them in a dry place.