Although annatto doesn't add much flavor, it gives the oil a bright orange-red color.
This recipe goes with Sofrito, Asopao de Pollo (Traditional Chicken Asopao)
Combine the oil and seeds in a small saucepan, and bring to a simmer over medium heat. Reduce heat to low; cook 5 minutes. Cool. Strain through a sieve into a bowl; discard seeds.
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Aceite de Achiote (Annatto Oil) recipe