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1
Put beans in a 4-to 5-quart heavy pot with enough water to cover by 2 inches.
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2
Bring to a boil and boil 2 minutes, then remove from heat and let stand, covered, 1 hour.
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3
Wipe anchos clean, then stem and seed. Discard ribs and tear anchos into pieces.
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4
Soak anchos in boiling-hot water until softened, about 20 minutes. Transfer anchos to a blender, reserving soaking liquid.
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5
Puree anchos with onion, garlic, chipotles with sauce, tomato paste, molasses, cumin, cloves, 1/3 cup water, and 1 teaspoon salt.
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6
Pat ribs dry and season with 1 1/2 teaspoons salt and 1 teaspoon pepper (total). Heat oil in a wide 6-to 8-quart heavy pot over medium-high heat until it shimmers. Brown ribs in batches, about 6 minutes per batch. Transfer as browned to a platter. Discard fat from pot.
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7
Preheat oven to 350u00b0F with rack in middle.
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8
Cook bacon in pot over medium heat until browned, then transfer with a slotted spoon to platter.
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9
Stir chile puree into fat in pot (it may spatter). Cook, stirring frequently, 6 minutes. Stir in reserved chile-soaking liquid, remaining 2 cups water, and cinnamon stick and bring to a boil. Return ribs and bacon to pot and braise, covered, in oven until ribs are very tender, 3 to 3 1/4 hours. Skim fat from sauce.
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10
Drain beans, then return to pot and add fresh water (8 cups), bay leaf, and 1/2 teaspoon salt. Bring to a boil, then reduce heat and simmer, uncovered, until beans are just tender, 1 1/4 to 2 hours (depending on age of beans). Drain just before serving.
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11
Serve short ribs with beans.
