I burned out several stumps a few years ago by simply tossing firewood logs onto them for a couple days. I did not use a can around them although that would have been nice. Every couple hours I would blast them with a leaf blower to get them glowing hot then toss on some more logs. I kept this up over a weekend and got them burnt down to just below grade. Other than my time, this cost me nothing.

On the farm as a 10 year old boy I was highly pissed of with my mother for not letting me buy explosives from the farm supply store. We had some pretty big stumps that needed blowing up and I was just the guy to do it.

Same here....rock hard Michigan clay dirt doesn't burn too well.:)

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Burning the stump is my go-to method. Works great.

Still burning? How's the progress?

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Yep, still going and is working really well. I should have used more charcoal on the biggest stump and done the smaller stumps later. The biggest stump is probably 6-8" below grade, except there was one spot where the trunk had a root that sticking out to the side where I didn't have charcoal (the plan was to spread the charcoal over to that spot, but I clearly forgot), and that point is still proud of the ground level. I took the coals from the two small trunks and from the center of the still very hot big trunk and stacked them up on that spot, so I suspect that by tomorrow or the next day that spot will be good. The two smaller trunks are good. In the future, I'll use a bit more charcoal. I've got one or two more trunks to burn. The key seems to be to use enough charcoal to cover the top of the trunks.

^^^ Great!...Let her burn!
I almost had a path in my lawn checking on the fire before the rain came. Sure beats swinging an axe. :)