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preheat cast iron skillet
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mix 1 slice pineapple, ¾ cup pineapple juice, canola oil, chipotle peppers, adobo sauce and garlic in a blender
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pour over pork in a plastic bag and marinate at room temp for 10-15 minutes or in the refrigerator for 1-2 hours
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chop remaining pineapple slices into chunks
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saute pork, until charred and cooked through, 5-7 minutes
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remove pork and saute onions about 2 minutes
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add pineapple and remaining ¼ cup pineapple juice and the pork and cook 1-2 minutes
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warm tortillas
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serve tacos topped with monterey jack cheese and cilantro