It is a Chinese Zamboni.
One of those things that squirts water on the ice skating rink to make it nice and smooth a couple times a day.
Only this one is more, shall we say, homemade.
But works just as well.
A big barrel, with metal extensions that somehow dribble hot water across a wide swath, pulled and pushed by 2 or 3 guys in boots.
I watched it in action today.
Have to go back a few times to refill the water.
That’s one way to keep in shape without getting that winter belly.