How To: The Only Seasoning Your Cast Iron Pans Will Ever Need

The Only Seasoning Your Cast Iron Pans Will Ever Need

Cast iron pans are a timeless treasure—they're an essential kitchen tool that will stand the test of time, and no home kitchen is complete without one. However, they do have a reputation for being difficult to care for... with arguments both for and against regular seasoning.

Image by Brenda Groth/Restful Trails Food Forest Garden

In 2010, a blogger named Sheryl Canter claimed that she found the best way to season a cast iron pan that would keep the cast iron from rusting... or requiring re-seasoning! And after a few hands-on test by Cook's Illustrated and The Kitchn with glowing reviews, it looks like this technique is the winner.

The Answer to Our Prayers: Flaxseed Oil

Various guides for cast iron seasoning will tell you that as long as the oil used for re-seasoning has a high smoke point, it's okay for use. The fact is, however, that the type of oil you use plays a huge part in how long the seasoning of the cast iron lasts.

In this case, flaxseed oil (the food equivalent of linseed oil) stands above the other types of oil for the purpose of seasoning a cast iron because it polymerizes into a solid form during hours of high heat—and solidly bonds to the surface of the cast iron pan, giving it a thick, complete coating. And since linseed oil is traditionally used to give paintings and wood finishes a hard, polished finish, it only makes sense that its food equivalent can do the same for cast iron pans.

Before and after flaxseed oil treatment. Image by Sheryl Canter/Sheryl's Blog

How Do I Season My Cast Iron with Flaxseed Oil?

The process is a little lengthy, but well worth the effort—especially since re-seasoning pans is a giant pain.

  1. Obtain flaxseed oil, either from Amazon (which we've linked to) or in the vitamins and supplements section of your grocery store.
  2. Make sure your pan is either new or stripped of its seasoning (if you leave the pan in your oven during a self-cleaning cycle, this will do the trick).
  3. Heat the pan in an oven at 200°F for 15 minutes to open up the pores in the pan itself.
  4. Remove the pan from the oven and add 1 Tbsp. of flaxseed oil to the pan, then rub the oil thoroughly into the pan using tongs and a paper towel.
  5. The pan should be cool enough to touch at this point; if so, then completely remove the oil from the pan by rubbing it dry with clean paper towels. If it's still too hot to touch, wait a few minutes, then rub the pan dry. The pan should be completely matte again, with no sign of glistening oil.
  6. Place the pan face-down in a cool oven, then set the oven to 500°F (or whatever your highest setting is) and bake for one hour.
  7. Turn off the oven and allow the pan to cool for two hours while still in the oven.
  8. Repeat the process five more times, or until the pan develops a dark, semi-matte surface.

Cambria from The Kitchn states that this method took her over 18 hours from start to finish, but left her with a pan that had an excellent preliminary seasoning; as she continued to cook with the new surface, she found that not only did the pan become even more nonstick with each use, but that it was an absolute snap to clean.

Image by Cambria Bold/The Kitchn

Cook's Illustrated testers found that the new seasoning had bonded so well to the cast iron surface that even a full run through the dishwasher didn't faze it whatsoever!

Time-Consuming, but Well Worth It

If you've ever suffered the pain of a rusted or gunky cast iron pan, you'll know how frustrating it is to clean and re-season it all over again. But with this ultimate way to season the pan, you'll barely require any maintenance or touchups to your pan—and get to enjoy the accumulated seasoning on its surface that makes cooking with cast irons such a joy.

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