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Add the tomato paste, beer, chili powder, cumin, salt, pepper, adobo, and cinnamon to the slow cooker. Whisk to combine.
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Add in all the remaining ingredients. Mix to combine.
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Set the slow cooker to low for 6 hours or high for 3-4 hours. Add more salt and pepper to taste.
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Once the lentils are tender, mix in the fresh chopped cilantro.
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Serve with shredded cheese, pico de gallo, hot sauce, tortilla strips, and/or sour cream.
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*If you can't drink or don't drink beer, you can substitute water or vegetable stock instead.