Bixa orellana
Annatto seeds come from the achiote tree. The USDA lists annatto as a substance for coloring various foods, like cheese, and as a textile coloring, but it is also used as a condiment for its mild, pepper-like flavor.
Annatto seeds are extremely hard and therefore very difficult to grind. You might consider buying the seeds already ground.
Some people are sensitive to Annatto, but it's considered safe in small amounts.
Annatto is used to make sauces and to flavor many different types of dishes in Vietnam, Mexico and other Latin American countries.
This short article covers the history and uses of Annatto as well as health risks from eating concentrated amounts.