Typically rated between 100,000 and 350,000 Scoville Heat Units, this small, plump pepper is one of the spiciest in the world. The habanero variety—commonly red or orange in color—is believed to have originated in the Yucatán Peninsula before being later transported to other parts of the world by Spaniards. Named after the Cuban city of La Habana in which it was regularly traded, the yellow habanero, or mustard habanero , is characterized by thin, waxy yellow skin, a floral aroma, and a fruity, citrus-like flavor. A close relative of the Scotch bonnet, the two varieties share similar heat, flavor and appearance characteristics. The habanero thrives in hot climates and is especially popular in Mexico where it’s commonly used to flavor tequila or mezcal.