Carolyn
I appreciate you asking for my thoughts on seasoning.
However I must disclose that my background is in dutch ovens and have only recently been getting interested in becoming a skillethead. But hey! Cast iron is cast iron wether it's round or flat.
I enjoy restoring and seasoning cast iron more than cooking in it. However I do like to cook and will be preparing a four course traditional Polish meal on Saturday, all outside in cast iron. Us Dutchies tend to do that.
Anyway, as far as cast iron knowledge was concerned, I had a brainless cranium full of mush when first getting into this sport. I followed a few old wives tales about cast iron that included seasoning @350, as recommended in the little booklet that comes with any Lodge product purchase. All that did was cause the cast iron to come out brown and sticky. But hey, if I cook in it every day for two years it'll eventually turn black, right? Not good enough for me.
The second fallacy of advice given all over is that you should spread a light coat of oil on the piece in between uses in order to prevent rust. All that did was cause funny tasting food the next time it was used . I thought that this was just the flavor of dutch oven cast iron and I just had to get used to it. Can you spell RANCID OIL!
So being an anal-retentive, obsessive-compulsive, I was determined to find out how to get this thick black hard seasoning with wonderfully tasting food that I always heard about, because it wasn't happening for me!
Eventually this web site by Colleen Sloan was discovered:
http://www.logcabingrub.com/products/dutch-oven/dotips.htmlColleen Sloan is the matriarch of dutch oven cooking. As I found out later, she is quite a celebrity in the DO cult. She was kind enough to speak with me on the telephone and set me straight on the care and maintenance stuff.
#1) Season @ 500
#2) Don't store your pot with oil. Keep it dry. If it's seasoned, it won't rust. Food will taste better.
Now, you ask why season CI at high temperatures. Well, ya gotta burn the oil. Plain and simple. For example, refined corn oil has a smoke point of 450 degrees. If you season @ 350 you're gonna have a problem.
Roger said that if you ask 10 people how to season CI you'll get 10 different answers. This is true. The way he describes seasoning makes sense imho. He takes a hot skillet, burns oil of some persuasion on it, does it multiple times, and lets it cool slowly. Sounds good . This is easier to do with a skillet than a 22lb dutch oven. Since I don't care to handle hot iron we just cover with a light coat of oil and "letter burn" in the oven for about an hour , then repeat a couple times. Result is the same. The "jist" (not a word) of this story is that the iron needs to be hotter than the smoke point of the oil.
So, when you read that some seasoning technique "turns the CI brown, but it will become black with use", it means that an incomplete initial seasoning has been performed and the high temperatures of regular cooking will finish the seasoning process by completing the burning of the oil.
Smoke:
Colleen Sloan recommends to season outside due to smoke and fire risk. I can tell you that if a VERY LIGHT coat of oil is used, there is no risk of fire and little, if any, smoke. If you gotta lotta smoke then yous gots too much oil.
Another factor in the amount of smoke that may be expierenced when seasoning iron is the quality of your oven. In our home we have a high-end (expensive) Lacanche stove/oven. Never had one peep of smoke out of it. And I season like crazy. However, at work there is a cheap a$$ electric one that when used has seasoning fumes and smoke coming up out of the heating elements on top of the stove. I just turn on the fan. No big deal. Also, multiple coats of light oil is waaaay better than one seasoning with heavy oil slopped all over. That advice never changes.
Lastly, What type of oil to use ?
Without getting into a lot of organic chemisty mumbo-jumbo, I can tell you this:
We want our seasoning to last-right!
We don't want entropy to rear it's ugly head. ( You can look up the word "entropy" yourself for full understanding)
So we want our seasoning to have a stable construct- right!.
Therefore, I think that it's best to go with a "fully hydrogenated" oil such as Crisco. Fully hydrogenated means that every carbon atom is fully attatched to as many hydrogen atoms that it can handle. There are no open areas in the chain of carbon atoms where a "free radical" can get in to spoil the oil or kink up the carbon chain.
It's best when the carbon chain is straight, like your dog's chain outside that's attatched to the water spigot. When the dog chain is straight, it works like it should and is less prone to breaking when Rover is tugging at it to get to the mailman. When your dog chain gets kinked, it's acting like an "unsaturated oil". This kinked chain is less stable. The dog chain is more likely to break at the kink. "Unsaturated means that the carbon chain has some open areas where there is no hydrogen atoms attatched. I won't get into cis and trans arrangements now, but these unsaturated oils are usually liquid at room temperature and are more prone to degradation, ie" becoming rancid and accumulating the funny smells in your pantry".
Fully hydrogenated oils are much more stable, have a longer shelf life, and are usually solid at room temp. This is Crisco.
So, I've experimented with seasoning techniques. Tried different kinds of oils at different temperatures. Oils such as Olive oil ( virgin, extra virgin, light, regular) , vegetable oil, canola oil, Crisco, peanut - the usual. I've found that a very thin coat of any oil works well if the temp is high. The seasoning temperature is much more important than the type of oil used. But from an understanding of organic chemistry, I think that a fully hydrogenated oil is the way to go.
As far as temperature is concerned, I don't think that anything magical happens at 500 degrees. It's just that the oil needs to be fully burned and five hunnert seems to do the job.
Just check out the dozens of testimonials on the IDOS site.
Try it-ya got nothin to lose!
It's now midnight. I'm going to put on the headphones and swill a few more beers while listening to some Emerson, Lake & Palmer tunes on Youtube. Perry, they are not a rap band! ;D
Otis "Chubby" Campbell