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In a large bowl, whisk together the beer, lime juice, garlic, parsley, chili powder, cumin, coriander, salt and pepper.
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Add the pork; turn to coat.
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Cover and marinate in the refrigerator for 4 hours.
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Place the pork on a greased grill over medium-high heat; brush with any remaining marinade.
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Close the lid and grill, turning occasionally, until just a hint of pink remains inside, about 18 minutes.
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Transfer to a cutting board; tent with foil and let stand for 5 minutes.
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Slice and serve.