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Place onion in the bottom of a slow cooker.
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Trim fat from pork roast.
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Rub roast with salt and pepper; arrange meat over onions. Add bay leaf, thyme leaves, and celery seeds to cooker. Pour barbecue sauce over roast.
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Cover and cook at low setting for 8-10 hours or at high setting for 4-5 hours.
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Transfer meat to a cutting board and allow to stand for 15 minutes; slice or dice to desired size.
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Remove excess fat from sauce; add desired amount of sauce to minced pork and stir to mix well. For sliced pork, spoon sauce over slices. Remove bay leaf before serving.