Molasses sweetens the beans, vinegar adds tang, and the chipotle chile powder makes them spicy.
Preheat oven to 325°.
Heat a Dutch oven over medium-high heat. Add chorizo; sauté 2 minutes. Add onion; sauté 5 minutes, stirring occasionally. Stir in broth and remaining ingredients; bake uncovered at 325° for 1 hour.
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