Truffle salt is a little different from most spice blends in that it has only been around for a few years. The combination of truffles with sea salt was first marketed by an Italian company called Casina Rossa in 2006. With the Casino Rossa version of the blend, the truffles come from Abruzzo in Italy and the sea salt comes from Sicily. Unlike other affordable substitutes for truffles (such as some truffle oils), truffle salt uses real truffles rather than a synthetic alternative.
Of course, neither component of the spice blend is new. Truffles are found within the roots of various trees, including those of the chestnut and hazel trees. Consumption of truffles dates back to the Ancient Egyptians, who prized them. They were consumed by both Greeks and Romans as well. Truffles were viewed as highly nutritious by both civilizations. The flavor and aroma were also considered to be exotic, which made them more valuable among wealthier classes.