Caviar is salt-cured fish eggs. The rarest and most expensive caviar comes from the endangered Beluga Sturgeon. Almas caviar from Iranian Albino Beluga Sturgeon costs $34,500 for 1kg.
Ayam Cemani Chicken
These chickens have black organs, flesh, and bones and are similar to India's Kadaknath chicken. Nicknamed the Lamborghini of chicken breeds, an Ayam Cemani pair costs $5,000.
Civet coffee
Also called Kopi Luwak coffee, it is made of semi-digested coffee cherries excreted by Asian palm civets. It is one of the most expensive coffees, with prices as high as $1,300/kg.
White Truffle
Native to the Piedmont region of Italy, white truffles only grow among the roots of specific species of trees. The world's largest white truffle was auctioned for $61,000 in 2014.
Swallow's Nest
Made of saliva, these nests are found on cliffs, and collecting them is dangerous. Swallow's Nest soup is a delicacy in China. In Hong Kong, a bowl of this soup costs $30 to $100.