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also it hasn't been used in forever so do i need to "season" it? and can i do that at home on are glass cooktop?
It wouldn't hurt to re-season the oven, considering it's sat unused for a long time.
what is the best way to season it?
Clean the oven with a wet rag (no soap or any other cleaner), dry it over a medium-low burner, spread a light coating of shortening (like Crisco) over all surfaces and bake in a pre-heated 450-degree oven for one hour. The oven and lid should be turned upside down in the oven. After the hour is over, turn it off and let the Dutch oven cool inside the oven. Be ready to vent smoke in the house.
i went to a friend camp a couple weeks ago and he had 2 A-frame poles with a ridge pole across them to hang to dutch oven from a chain, so he could raise and lower the oven. is this the best way? he also said it would work better if i used charcoal bricketts to regulate the temp. - is that the better way or can i just watch my fire closely?
I'd use charcoal briquettes until you get a feel for temperature control. There are any number of charcoal charts available on the Internet. When you're comfortable with heat control, you can transition to campfire coals as I often do.
I have a friend who's a professional BBQ and Dutch oven caterer. He doesn't use briquettes any more. Leonard preferes to use a lump charcoal, like Lazzari briand, because it replicates campfire coals like a cowboy cook used.