Let’s forget Caviar and those expensive Truffles, bird’s saliva is the food of the well-heeled, at least in China anyway. Bird’s nest soup, is an expensive delicacy made from rare bird’s nests created from the saliva of small swiftlets. The nests, which have been used in Chinese cooking for over four centuries, are dissolved in water to make a soup which is believed to have exquisite flavour and be of benefit to health. These bird nests are considered to be one of the most expensive animal food products consumed by humans.
A single bowl of it costs between $30 and $100. Only the edible nest of theCave Swiftletwill do, a nest made entirely out of the bird’s saliva. These nests are high in calcium, iron, magnesium and potassium. They are hard when harvested, but partially dissolve into a more jelly-like consistency when boiled into soup. Harvested nests still sell for as much as $10,000 per kilogram.
Due to the high mineral content of the nests, eating them is believed to enhance lung health, prevents coughs, improve constitution and even promote longevity. The nests are nearly 50 percent protein and 30 percent carbohydrates, with a relatively small amount of inorganic salts and fibre.
Let’s forget Caviar and those expensive Truffles, bird’s saliva is the food of the well-heeled, at least in China anyway. Bird’s nest soup, is an expensive delicacy made from rare bird’s nests created from the saliva of small swiftlets. The nests, which have been used in Chinese cooking for over four centuries, are dissolved in water to make a soup which is believed to have exquisite flavour and be of benefit to health. These bird nests are considered to be one of the most expensive animal food products consumed by humans. 
Straight Outta My Kitchen 