I made a Swedish torch (rocket log)

[gwalchmai]

Just for fun I drilled a couple of holes into  this log with a 1" spade bit. I was amazed at the result. It burned for six hours and made a great (small) cookfire. I'll make some more. I think three this size should be about right for that pit. 

[Fog]

In the woods we would cut a cross with a chainsaw through a chunk of firewood from a standing dead tree to cook food and heat our hands.

Sometimes I'd hollow out the middle a little with a couple extra plung cuts with the bar. 

Used the "noodles" from chainsaw cuts to light the log. 

Cast iron pan on top. Viola!

[Huaco Kid]

I often use three small logs (~6" across) and stand them on end next to each other in a triangle. Then light a small sawdust fire (or some firestarter chunks) in the center.

Let it catch and grow slowly and it usually turns into a jet-flame out the top.

Cast iron pan on top.

If you let it run itself, they usually last a really long time.