What is the best way to roast dandelion root to be used as a coffee substitute?
Is there a specific method of roasting the roots ? Dry and crispy or all but burnt ? Anybody know?

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Once you have the dandelion roots, wash them really well, and then chop them up and/or run them through a food processor to get them into a coarse mixture.
Spread the root pieces onto a cookie sheet (no more than a half inch deep) and put in an oven set to about 250F and keep the door slightly open so that the moisture can escape. The goal is to dry them first, so rotate the sheet on occasion and stir them, to speed things up.
In total you'll need about 2 hours to do this. You'll see that they shrink quite a bit as they dry and in the last part of the time they will actually roast. They will turn from a pale color to more of a darker coffee bean color. When they closely resemble ground coffee (but not burnt), you can take them out to cool and then enjoy!
I have tasted dandelion root "coffee" - hideous stuff, I only managed to finish it to be polite to my host.
Roast slowly in the oven on a baking tray. then grind when dried out and suitably roasted.