Bring a small pot of water to a boil. Add the dried chiles, then remove from heat. Let soak for 10 minutes, until softened. Drain.
In a blender, combine the softened chiles, adobo sauce, garlic, salt and spices, Marukan Organic Seasoned Rice Vinegar, and pineapple juice. Blend until smooth.
Slice the pork horizontally into long, 1/4’’ thick pieces Place the pork in a large bowl or zip-top bag. Pour the marinade over the pork, ensuring all pieces are coated. Cover and refrigerate for at least 4 hours (overnight is best for deeper flavor).
Remove pork from refrigerator and let sit at room temperature while the grill preheats. Preheat grill to medium-high temperature. Oil the grates.
Remove the pork from the marinade. Grill the pork a few minutes per side or until it is charred and reaches and internal temperature of 145°F. Remove from grill and let rest.
Make the Grilled Pineapple Salsa:
Grill the pineapple slices for 2-3 minutes per side, until caramelized. Let cool slightly, then dice into small chunks.
In a bowl, combine the grilled pineapple, red onion, jalapeño, cilantro, Marukan Organic Seasoned Rice Vinegar, and lime juice.