Cast Iron Seasoning
(from mancavechef.com)
Oil
- Unsaturated fats polymerize best, so the highest ratio of unsaturated to saturated fat (and non-fat contaminants) is best.
- You need to exceed the smoke point of the oil used.
- Options
- Flaxseed (top choice, 450 F smoke point, a bit expensive)
- Due to expense, might be a good choice for initial seasoning, but then use others for maintenance.
- Grapeseed (second choice, 420 F smoke point, less expensive)
- Acceptable choices: corn oil, olive oil, sunflower oil
- Poor choices: bacon fat, lard, coconut oil, cheap oils (likely to have contaminants).
Seasoning
- Clean
- Do this even with new cookware, as well as when seasoning has holes. Be thorough to ensure the best bond between seasoning and metal.
- Scrub with 1/4 cup of kosher salt, using fingers.
- Wash with hot, soapy water. Place in the oven or on a stove and heat it completely dry.
- Oil
- Lightly coat inside and out with oil.
- Add 1 tsp of oil and spread around with fingers. Don't use a paper towel as it will leave micro-scraps on rough parts of the pan.
- Add more oil as needed, but be very sparing. Multiple very thin coats are the goal. Don't add so much you get pools or drips.
- Polymerization occurs with oxygen, which you want to happen as close to the metal as possible, thus thin layers. Thick layers will end up gummy and then peel off.
- Seasoning the outside of the pan helps protect against rust.
- Heat
- Bake in an oven, upside-down for 30-40 min. This lets any excess oil drip out (put foil under it to catch excess).
- Use high enough heat to exceed the smoke point by a margin (465 F for flaxseed, 450 F for grapeseed). You'll smell oil and smoke after about 15 min; ideally do this when you can open the windows.
- Remove the pan and allow it to cool to room temperature on the stovetop.
- Repeat
- Do steps 2 and 3 about 4 - 6 more times to build up more layers. The whole pan should be dark and glossy.
- Avoid cooking acidic foods (such as tomatoes) right off the bat, until regular usage has helped thicken the seasoning further.
- Consider re-seasoning the pan a few times a year.
Usage & Notes
- Never let your cast iron soak, especially in soapy water. Don't let it drip / air dry.
- Modest cooking of acidic foods is okay, but does erode the thickness. Alternate with other foods to rebuild the seasoning.
- Using plastic / wood utensils is good practice, but metal isn't immediately doom.
- The best way to clean the pan after use is while it's still hot.
- Remove excess food, wipe away residual oil.
- Don't use scouring scrubs. If necessary, try scrubbing with kosher salt and then heat warm water on the stove to loosen material.
- A little, quick soap is okay
- Dry promptly on the stove or in the oven.
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