Cleaning – Sticky Aluminum Half Sheet Pans in Self-Cleaning Oven: What Happens?

Smoke is normal in an electric oven, but flames are definitely not.

In order to start a fire, you either need a spark, or you need to heat something beyond its autoignition temperature (AKA kindling point). You might have had a short - or you might actually be using a gas oven with spark ignition - but I'm guessing your issue was the latter.

Cooking oil or grease being heated beyond its autoignition point is one of the most common causes of kitchen fires (grease fires). Supposedly, some oils have autoignition points as low as 550° F (or 288° C), though I'm not sure which oils those are. Olive oil would be my guess as the lowest, but pepperoni grease could very well have ignited at self-cleaning temperatures (which, as you noticed, go up to nearly 1000° F).

Fortunately for you, all modern ovens have a mechanical interlock which prevents them from being opened during a self-cleaning cycle. If you'd opened it, you would have made the problem a lot worse by (a) supplying the fire with abundant oxygen, and (b) drawing all the hot air and flames out of the oven and into your kitchen, quite possibly setting your whole home on fire. Heat wants to move to where it's cold; that's why you keep your doors and windows closed in the winter.

There are a multitude of oven cleaners available for self-cleaning ovens - you are supposed to use these before you run a self-cleaning cycle. Yes, I know it's odd, but "self-cleaning" doesn't really actually mean that it cleans itself, it just gives you a little extra help. You need to try to clear out all the grease and big chunks of food first using one of these cleaners, then run the self-cleaning cycle to deal with anything you might have missed.

There is a video at the manufacturer's web site.

My French is strictly limited, but it is pretty self explanatory even if you cannot read the captions. Just be prepared for some really cheesy music.

It appears you were supposed to wash off the beeswax (which is probably just to keep it from rusting during shipping and storage) and then season it much like any cast iron pan (although this is a die-pressed iron pan, and should be smoother).

The following advise is specifically in response to the original question asking how to remove the seasoning so that it can be re-seasoned as the OP desires. The general advise against using detergent or soap on a cast iron or pressed iron pan is to protect the seasoning on the pan, not the metal itself:

Now that you have a wierd amalgamated coating, I would wash it with something strong--like dishwasher detergent or Barkeeper's Friend--then when you are back down to the metal, season it as desired.