Caviar is, by any definition, never cheap. Its name comes from the Persian for ‘roe generator’, “khag-avar”, so it is appropriate that the very most exclusive – and expensive – caviar comes from Iran. Almas Caviar is available in just a small number of Caviar House and Prunier stores, housed in a metal container surrounded by 24-karat gold. A kilo of Almas will set the owner of a most discerning palate back more than $25,000. Should you invest in a tin, serve it cold on thin toast – and savour it, slowly.