Add the annatto seeds (achiote), oregano, coriander, cumin, peppercorns and salt to a food processor or blender. Process to break everything apart. You can also use a mortar and pestle to grind them up.
Add the garlic, orange juice, lime juice and vinegar. Process to form a thick paste.
You can adjust with extra juice or a bit of water for a thinner paste.
Use as desired.
