Misc: The Who's rock musical stars Elton John. It's called ________.?

Questions

The Total Perspective Vortex was powered by a piece of this (specific):?

A mind-boggingly stupid, but very very ravenous, animal.?

Fisherman's stew, literally means "boil on low heat" (watch the spelling)?

Thin pancakes with an orange liqueur sauce?

Less stimulating than tea or coffee, an infusion?