Place garlic, salt, peppercorns, and oregano in a food processer until chopped.Add oil and vinegar and process to paste. Place pork in a large roasting pan fat side up and score with a knife. Rub mixture over meat; refrigerate 3 hrs or overnight.
Preheat oven to 350*.
Place pork in oven and roast 3 hrs. Let cool slightly then chop or tear into large chunks.
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