Achiote Sauce

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1 tablespoon unsalted butter

1 onion, roughly chopped

3 garlic cloves, minced

1 1/2 tablespoons tomato paste

1 1/2 tablespoons Achiote paste, crumbled

2 tablespoons white vinegar

2 cups chicken stock

1 teaspoon salt

2 teaspoons cracked black pepper