Aristotle Onassis, the Greek shipping magnate, lived an actual life of luxury, not just an illusion that humans should create to get rich. But what kind of food do the rich (and often famous) need when they dine in smart restaurants? And will that one drink wipe out their bank balance?

The following foods and drinks are synonymous with luxury.

Caviar, needless to say, is the fish roe of the sturgeon that lives in the Caspian and Black Seas. Iranian caviar is extremely rare and by weight is the most expensive food in the world. Onassis and friends used to eat it with mother-of-pearl inlaid spoons while drinking champagne.

Matsutake mushrooms (matsutake) are rare and extremely expensive, on the verge of extinction. Matsutake is a smoky, spicy-smelling mushroom grown mainly in Japan, and in the past it was harvested in the fall. In the past, they were harvested in the fall, but recently, the trees on which matsutake mushrooms grow have died. Harvesting matsutake mushrooms is relatively easy, but cultivation has not yet been successful. Therefore, sourcing matsutake mushrooms in a hostile wild environment can bring prices as high as $2,000 per kilogram.

But matsutake is not the only first-class fungus. The second most expensive food in the world by weight, the truffle is a rare delicacy and is also known as the "king of fungi. Truffles are difficult to cultivate and must be collected using pigs and dogs, which is time-consuming, requires skill, experience and expertise, and is therefore expensive. The most expensive truffle ever sold, weighing 1.51 kg and costing $160,406, was sold by a Hong Kong real estate tycoon to his wife, who said she liked Italian white Alba truffles.

Both rap stars and royalty prefer the delicate fizz of Champagne, France's finest export. There are many champagne makers to choose from, including Krug and Moët & Chandon; a bottle from 1900 sold in 2005 cost $17,625.

If you thought champagne was more expensive than wine, think again. A bottle of Chateau Lafite sold for $160,000 and a 1947 bottle of Chateau Mouton Rothschild sold for nearly $115,000. Both of these meaty red wines would look right at home on a billionaire's dinner table.

Believe it or not, the rich can buy super expensive bottled water to flaunt their status in smart restaurants; Bling H2O is a celebrity water that costs about $40 for a 750ml bottle. But the king of water is undoubtedly Acqua di Cristallo Tributo a Modigliani, which sells for $60,000 per 1.25ml bottle. This water is a mix of French, Icelandic and Fijian water and the bottle is made of 24 karat gold.
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