Seasoning a grill has no relationship to seasoning the steak or eggplant you're grilling. In the latter case, you season to add flavor to the raw food item. But when you season a cast iron grill, you're not adding flavor. It actually refers to the process of coating the grill grate with oil, then heating it, to render it rustproof and create a virtually nonstick surface. Depending on the type of grill you own, you may only need to season the grill the first time you use it and occasionally after that. And with a Weber brand grill, you may not need to season it at all.
New grills oftentimes come with pre-seasoned grates, however, for those looking to care for an old favorite or cast-iron grates with build-up of cooked-on drippings, follow these simple steps to completely re-season or maintain the regular care of your BBQ grill. Seasoning grill grates is not only a good way to care for and prolong the life your your grill, but ensures the food you’re cooking is free from carcinogens and at its tastiest every single time.
After about 30 minutes, turn the heat off and let the grill cool down. Wipe things down to remove any lingering residue and you should be good to go. The grill grates should have turned a bronze or dark brown color if they are metal or a darker brown/black color if they are cast iron. For cast iron grates, the oil will have penetrated the pores of the metal and created a smooth non-stick surface that will be perfect to cook on.
When finished, you’ll have ears of corn with varying degrees of husk and silk clinging to golden, lightly charred corn and you’ll probably be wondering how the heck to husk it. Remove the ears from the grill and cool for five minutes. Then you should be able to easily pull back the husks and silk. Use a clean kitchen towel to wipe away any unwanted silk or charred husk flakes.
If you're all right with all that and want to give this method a try, here's how: Pat the meat dry with paper towels and sprinkle both sides of the steaks generously with Kosher salt. Be sure to get the salt on the edges of the steaks as well. That's 1½ inches of surface you definitely want to cover. Press the salt crystals into the meat with your hands.
When the grill is cool, remove the grates and flavorizer bars and put them into a full bucket of soapy water. Let them soak for at least 15 minutes. Remove anything else from the grill that you can take off without tools, like burner control knobs and the grease tray. This will make it easier to clean. Most gas grill burner tubes are removable as well (look for simple cotter pins on one end, although some models use screws).
To achieve a crust on the outside while keeping the interior of the steak cooked to your liking, you need to have two different temperatures set on your grill. In order to get those nice grill marks, you need to heat your grill to high heat to essentially sear the steaks. To determine the heat is hot enough, you should be able to hold your hand about an inch over the grill grate for 1 second before it feels too hot and you must pull it away.
Clean the exterior of the grill. Soapy water is the safest cleaning solution for most gas grills. Just make a cleaning solution with water and a squirt or two of mild dishwashing soap. Wipe the exterior of the grill with the soapy water, use a rag dipped in clean water to remove the soap residue, and then dry the exterior of the grill thoroughly.