(Mother Nature Network) While expensive caviar is nothing surprising, a father and son team have taken the luxury delicacy to the absolute extreme – combining the eggs from the extremely rare albino sturgeon with a healthy sprinkling of 22-carat gold flakes. The end result, titled "Strottarga Bianco," is what's being deemed the 'world's most expensive' food – with a kilo expected to retail for over $305,000 (or nearly $1,100 a teaspoon).
While adding gold flakes to any food would bump its price, it's the scarcity of the albino sturgeon that's really driving the inflated value of the caviar. The species, found in the southern Caspian Sea in Iran, is critically endangered from overfishing and poaching. Because of its slow reproduction (it takes 19-22 years for a female sturgeon to reach reproductive maturity), scientists estimate that it will be more than 100 years before populations fully recover.