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Cook chuck roast with onion in slow cooker on low for 7-8 hours or high for 3-4 hours.
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Remove roast from crock pot and let cool then shred the roast.
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Add thawed red chili puree to roast juices and stir.
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Add shredded beef back to the crock and cook on low until red chili is absorbed, typically 3 hours.
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Add salt and pepper to taste, enjoy!