Jugyeom, or nine times roasted bamboo salt, sometimes also known as purple bamboo salt, can cost almost $100 for an 8.5-ounce jar. To make bamboo salt, sea salt must be repeatedly roasted inside of bamboo at temperatures over 800 degrees celsius. The goal is to enrich the salt with minerals and to reduce toxicity. But depending on where you buy it, purple bamboo salt can cost more than 10 times the price of pink Himalayan salt. That labor-intensive process makes purple bamboo salt the most expensive salt in the world.