Achiote paste is a bright orange seasoning paste from the Yucatan made from ground annatto seeds, oregano, cumin, cinnamon, pepper and cloves. It is often thinned with vinegar or citrus juices for marinades and sauces and should always be cooked first to remove any chalkiness. This is what produces the bright orange color often found in Mexican food, so be sure to wash off any utensils that touch it or they just might remain orange. The paste is sold in bricks in Mexican markets and can be kept well wrapped in the refrigerator for a long time.