Vodka is often thought not only to be the most authentic partner to caviar, but the best. Authentic, perhaps, if your caviar is Russian; but if it's Iranian the sparkling water might be more appropriate. And the best? It's perfect, as Fay put it, "to close down the taste-buds and tell them that it's all over", but actually sipping neat vodka as you eat spoonfuls of caviar seems to me to prize ritual over sense.