These seeds can be ground into a powder, which is referred to as both annatto powder and achiote powder. They can also be simmered in oil to create brightly colored achiote oil. When ground with ingredients like garlic, vinegar, oil, and salt, it becomes the achiote paste called for in our recipe.
Achiote turns up in one form or another in many major Mexican dishes, from mole sauce and tamales to certain stews and bean dishes. It can be used in a marinade or dry spice rub for grilled meat or mixed with oil to brush onto seafood. It sounds like once you start cooking with it, finding ways to use it is not really a problem!
The seeds are said to be incredibly hard. Several sources recommended soaking the whole seeds in warm water for ten minutes before grinding them in a spice grinder or with a mortar and pestle. The whole seeds can also be used on their own and then removed before serving, like bay leaf or cardamom pods.
Here are a few sources for buying annatto seeds, achiote powders, and achiote pastes:
How do you use achiote or annatto in your cooking?
Related: From the Spice Cupboard: Fenugreek
(Image: Gourmet Sleuth)