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No luck with burying the charcoal, it just goes out. Now trying putting charcoal in the bottom of a ceramic plant pot with drainage hole in the bottom then setting a fire beneath. Hopefully oxygen will keep it burning. charcoal also up the side of the pot to increase potential air flow
I'm having some issues with keeping charcoal burning for long enough and not permeating the sawdust beyond the top layer. I think maybe coal is better like you say in the instructable although currently trying burying the charcoal rather than setting it on top, perhaps I will have more luck this way
I wonder why it's bad to scorch the salt by boiling the water and also why it's bad to have the oven on 'too hot'