5 pounds dried black beans, picked over and rinsed
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water to cover
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1 (24 ounce) jar tomato paste (such as Tukas®)
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1 head garlic, peeled and sliced
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¼ cup dried onion
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4 tablespoons mustard seeds
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5 dried pasilla chile pods
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5 sticks cinnamon
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2 tablespoons ground cardamom
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5 teaspoons cumin seeds
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1 tablespoon dried Mexican oregano
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1 tablespoon brown sugar
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1 tablespoon dried epazote, or to taste
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salt to taste
Instructions
Heat oil in a 12-quart pot over medium-high heat. Add onions; saute until translucent, about 5 minutes. Add beans and enough water to cover by 3 to 4 inches. Stir in tomato paste, garlic, dried onion, mustard seeds, chile pods, cinnamon sticks, cardamom, cumin seeds, oregano, brown sugar, and epazote. Bring to a boil.
Cover and reduce heat. Simmer, stirring occasionally, until beans are tender, 3 1/2 to 4 hours.
Uncover and increase heat to high. Boil, stirring from the bottom to make sure the beans do not burn, mashing a bit as you stir, until the sauce has thickened, about 30 minutes. Season with salt.