Annatto Seed Annatto seed is popular in Indian and Hispanic cuisines because of its bitter, earthy flavoring and the rich saffron hue it imparts. Combine with garlic, oregano, vinegar and a choice of other spices to create achiote paste, a pungent Latin rub used on meats and seafood to give a rich mahogany glaze. Annatto seeds are also found in tamales, stews and rice dishes. Whole annato is difficult to work with, as the dried seeds are very hard and quite difficult to grind, so we now offer a ground version.