Once the fire on top of the log is burning, all you further need is patience.
And to add some fuel every now and then.
After a while - sooner than you would expect - the fire kind of sinks into the log.
Once the inside of the log is burning, you can stop adding fuel. The saw cuts work like a chimney, causing an air flow which keeps the fire burning. At this point, you've made yourself a real Swedish torch.
On top of the Swedish torch, you can place a kettle or a pan. You can also wait until the inside of the log stops burning and starts glowing and then grill sausages - like we did this time.
Please note: don't use paraffin, petrol, gas or something like that to light the fire.