I’ve been really curious about rocket stoves. I see people interested in sustainability, survival skills, and camping post about them from time to time. Turns out, my father has been interested too. He’s more mechanically-minded than I am, so he made one using BPA-free cans (supplied by yours truly). I also helped him by gathering fuel on my most recent nature walk. He finally tried it and, for just a tiny test stove, it was really impressive! Before I got my camera out, the flames were quite large. My father feels confident that he could have boiled water with that.
I might not have a proper fire pit, but perhaps a little rocket stove could get the job done if I ever wanted a flame large enough to make offerings into.
Have you explored rocket stoves?