It’s not a “staple,” but it serves as a signal since it’s pricey. Truffles are, too, although they don’t keep as well as mushrooms. Because caviar can be delivered, it has become a global symbol.
Nobody considers caviar to be a basic meal, in my opinion. Truffles aren’t something they’d consider a must-have.
I prefer the saltiness of caviar to the sweetness of truffles. Chocolate truffles, on the other hand, may become a regular.