Make as a side to black beans for a nice vegetarian meal. Annatto seeds are brick red, triangular in shape, 1/8” - 3/16”. The seeds are available whole and can often be purchased in a block or paste form at Latin American section of your supermarkets. Annatto was once used to control fevers, dysentery and kidney diseases, though is now used mostly as a dye in medical preparations such as ointments and plasters. In India the pulp is used as an insect repellent.