I learned to ice-skate on a lake in Connecticut. My father built a warming fire in an old barrel (oil barrel?) and a group of us would skate, warm up, skate, warm up and repeat, for hours.
How does one build a warming fire in an old (oil??) barrel? What are the caveats? For how many fires will the barrel last before losing its integrity? Do people still do this, or does every skateable lake have a warming hut with all the conveniences?