0.5 (12 fluid ounce) can or bottle diet pepper-type soda (such as Diet Dr Pepper®)
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0.25 cup reduced-sodium Worcestershire sauce
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2 tablespoons minced garlic
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2 tablespoons liquid smoke flavoring
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1 teaspoon paprika
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0.5 teaspoon red pepper flakes
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0.5 teaspoon ground cinnamon
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0.5 teaspoon ground nutmeg
Instructions
Cut each pork tenderloin into 4 pieces and place into a slow cooker; set to High.
Stir onions, barbecue sauce, crushed tomatoes, diet soda, Worcestershire sauce, garlic, liquid smoke flavoring, paprika, red pepper flakes, cinnamon, and nutmeg in a bowl; pour mixture over pork tenderloin pieces. Cover and cook until tenderloin pieces begin to shred at the edges, 3 to 4 hours.
Shred meat using 2 forks; reduce slow cooker setting to Low and cook 1 more hour.