I looked my bowl out last night(one with the holes), used a small circular bit of SS to cover the holes in the bottom and sparked up a small fire , sat with my 3yr old daughter for about an hour with the fire blazing away no problems noticed even with a strong breeze it burned really well and as the fire burnt down , we just started to close up the bowl, which seemed to concentrate the heat , it was then time to put my little one to her bed, so I just closed the bowl over the embers.
1hr later I went back out & started it up again from the still glowing embers. This is great , I'm glad I saw this post . It's much better than any of my other little back garden stoves, cleaner & leaves no marks where it was sitting , which will make the missus happier. I'll just have to try it next time I go out on a little jaunt & see if I can brew up using it.
Tree