Step 1: Coarsely chop 1 onion half. Coarsely chop 2 pineapple rounds, discarding core; cover and chill remaining pineapple. Place chopped onion and chopped pineapple in blender. Add orange juice and next 7 ingredients; puree marinade until smooth. Place pork in large resealable plastic bag. Add marinade and seal bag, releasing excess air. Turn to coat. Chill at least 4 hours and up to 1 day.
Step 2: Prepare barbecue (medium-high heat). Grill remaining pineapple until warm and slightly charred, 4 to 6 minutes per side. Grill pork with some marinade still clinging until slightly charred and cooked through, 2 to 4 minutes per side. Transfer pineapple and pork to work surface; chop pineapple into 1/2-inch cubes, discarding cores. Chop pork. Transfer to platter; toss to combine.
Step 3: Meanwhile, finely chop remaining onion half and place in medium bowl. Add cilantro; toss to combine. Grill tortillas until warm and slightly charred, about 10 seconds per side.
Step 4: Serve pork-pineapple mixture with onion-cilantro relish, Smoky Two-Chile Salsa (separate recipe posted on this site), and lime wedges.
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