This is a problem as we all know it, the only solution that's been presented is getting a mini stove and going full hot-tent, but it's hard when hiking on foot, shit's heavy, yo.
Some might think - what about those tourist gas stoves/heaters.
This is a very bad idea because it produces fuckload of H2O, it's just a chemical reaction, an engineer explained it to me.
So I have been searching for a solution for years, and found this by chance.
Polish fishermen use it when fishing at night or staying at one spot for days, and aparently it works wonders.
They just use oven built from clay pots and use regular tealights.
I will test it myself after Christmas.
https://www.youtube.com/watch?v=opq_1Xa4ZHE 