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First, take the reserved liquid and reduce by half and set aside.
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In a heavy saucepan, melt the butter. Sauté the onion and garlic in the butter until translucent, about 10 minutes.
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Add in the reduced Dr Pepper and reduce again by half.
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Add in the rest of the ingredients and simmer for about 15 minutes.
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Continue cooking for 20 to 30 minutes, the sauce will begin to thicken.
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Let cool. Once cool, put in a blender and blend until smooth.
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Shred the beef and put in a pot with about 1/2 cup of the BBQ sauce and 1/2 cup of chicken stock. Simmer on low heat for an hour.
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Assemble sandwich with bread, pickles and red onions and be sure to add some more BBQ sauce.