Step 1
Place dried guajillo and pasilla chiles into a bowl and pour in boiling water to cover. Let chiles stand 30 minutes to soften.
Step 2
Cut pork tenderloins in half crosswise and in half again lengthwise again to make 8 long strips.
Step 3
Drain water from chiles and pour in pineapple juice and vinegar. Add garlic cloves chipotle pepper cinnamon cayenne pepper cumin and oregano. Transfer chile mixture to a blender and blend to make a smooth marinade.
Step 4
Place pork into a resealable plastic bag and pour marinade over pork; knead bag several times to coat pork. Squeeze out excess air and seal the bag. Refrigerate overnight.
Step 5
Preheat outdoor grill (preferably charcoal) for high heat and lightly oil the grate.
Step 6
Remove pork from bag and drain and discard marinade; transfer pork to a platter. Drizzle meat with 1 tablespoon vegetable oil and season with salt. Use tongs to gently stir pork pieces to coat lightly with oil.
Step 7
Cook pork strips on preheated grill until meat shows good grill marks and is lightly pink in the center 7 to 8 minutes per side. An instant-read meat thermometer inserted into the center of the largest piece should read at least 145 degrees F (65 degrees C). Transfer pork to a fresh platter.
Step 8
Drizzle a nonstick skillet with 1 teaspoon vegetable oil and place over medium heat. Lay a tortilla into the hot oil and place 1 slice of Monterey Jack cheese into center of the tortilla. Cook until tortilla is hot lightly browned on the bottom and cheese has melted 1 to 2 minutes. Repeat with remaining tortillas and cheese slices. Transfer each tortilla to a plate.
Step 9
Slice pork strips across the grain into pieces about 1/4 inch thick. Divide shredded cabbage onto each tortilla and top each with about 6 slices of pork 1 tablespoon roasted tomato salsa and a few slices of jalapeno pepper. Fold taco over fillings to eat.