Achiote is a spice blend made from annato seeds. It is used to flavor meats and seafood. It's best with pork or seafood. You can find it in most markets or online at places like Mexgrocer or Amazon.
For the achiote rubbed pork loin, we dissolve the achiote in pineapple juice to make a thick paste, we then season it with a bit of kosher salt. The achiote/ pineapple paste is then rubbed onto the pork loin, then roasted in an oven.