I'm just going to say it:
The onion volcano that a chef creates at a traditional hibachi restaurant is seriously overrated.
Flammable oil poured into a stack of concentric onions rings and lit on fire?
Had I done something similar to this at Scout camp (and I did), I'd be holding fire buckets for at least an hour as punishment (and I was).
Do nearly the same thing in proximity to a dozen or so patrons at a hibachi restaurant, and everyone around the grill goes nearly orgasmic.
Are we so starved for entertainment that we find flaming oil burning from the top of an onion cone something worth of our verbal exultations?
I really don't think so.