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1
In a medium saucepan, heat the 1 tablespoon of oil.
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2
Add the garlic and cook over moderately high heat, turning occasionally, until lightly browned, about 1 minute.
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3
Stir in the oregano, cumin, pepper and cloves and cook until fragrant, about 1 minute.
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4
Add the chiles and cook, stirring, until blistered in spots, about 30 seconds.
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5
Add the pineapple juice, vinegar and achiote paste and bring to a boil.
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6
Remove from the heat and let stand for 5 minutes.
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7
Transfer the chile mixture to a blender and puree until smooth.
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8
Season with salt.
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9
Scrape the marinade into a large, sturdy plastic bag.
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10
Add the pork and turn to coat.
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11
Set the bag in a small baking dish and refrigerate overnight.
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12
Light a grill or preheat a grill pan.
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13
Brush the pineapple and onion with oil.
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14
Grill over high heat, turning once, until lightly charred and softened, 3 to 5 minutes.
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15
Transfer to a carving board and tent with foil.
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16
Remove the pork from the marinade.
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17
Grill over high heat until lightly charred and just cooked through, 2 to 4 minutes.
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18
Transfer to the carving board and let rest for 5 minutes.
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19
Cut the pineapple, onion and pork into thin strips and transfer to a bowl.
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20
Season with salt.
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21
Serve with corn tortillas, chopped cilantro and lime wedges.