I break the end silk off, leave everything else intact, and toss it over a medium/low flame. I'm not sure how that equates to charcoal. Maybe 350 degrees on my lid thermometer. Rotate 180 the first time, then 90, then 180 again, so all the husk gets "color". And yes, the husk will turn black, but don't worry about it. Also, I have the lid down most of the time, but not towards the end, unless whatever else I am cooking requires the lid be down, then sometimes I will switch the corn to indirect if I think it's done. It takes somewhere between 25 minutes and 45 minutes..... It is one of those things I never pay attention to time anymore. The kernels are plump, juicy, and maybe just a few starting to turn goldish brown. No soaking necessary either. It's one of those things you usually have to do a couple times to get a feel for.