Slow-Cooker Pineapple Al Pastor Pork & Red Pepper Fajitas Step-by-step instructions

Before you start

Before starting, slice the pork loin into strips about 1 inch wide and 2 inches long. Cut the red bell peppers into thin strips and the red onion into half-moons. If using fresh pineapple, peel, core, and cut it into 1-inch chunks—about 2 cups. Measure the achiote-guajillo pineapple sauce.

Have the Chihuahua cheese shredded and ready. For serving, dice the white onion, chop the cilantro, slice the avocados, and cut the key lime into wedges. Prepare the tortillas by warming them in a dry skillet or directly over a gas flame until charred in spots.

Instructions

Phase 1: Build the Base

1. 1Layer the Slow Cooker
   Place the sliced pork loin, pineapple chunks, red bell peppers, and red onion into the slow cooker. Pour the achiote-guajillo pineapple sauce over the top. Use tongs or a spoon to toss everything together until the pork is well coated in the sauce.
   Look for All ingredients are evenly coated in the red sauce.
   Tip For even cooking, slice the pork into uniform strips about 1 inch wide.
2. 2Cover and Cook Low
   Cover the slow cooker and set it to LOW. Cook for 6 hours, until the pork is fork-tender and easily pulls apart. The pineapple will soften and release its juices, creating a rich sauce. Let it rest for 3 minutes before slicing.
   Look for The pork is tender and shreds easily with a fork.
   Safe temperature 145°F (63°C) internal temperature (steaks, chops and roasts)
   Tip Resist lifting the lid during cooking—every peek adds 20 minutes of cook time.

The slow cooker should be filled with pork strips, pineapple chunks, red bell peppers, red onion, and the achiote sauce, all tossed until the pork is evenly coated. The mixture will look vibrant red with visible chunks of fruit and vegetables.

The sauce should be well distributed, not clumped in one spot. This is the moment to adjust the seasoning if desired—though the sauce is typically salty and flavorful enough on its own.

Phase 2: Melt the Cheese

3. 3Add the Cheese
   Once the pork is cooked through, sprinkle the shredded Chihuahua cheese evenly over the top. Cover and let it sit for 5 minutes, or until the cheese is fully melted and bubbly. Let it rest for 3 minutes before slicing.
   Look for The cheese is molten and stretches when lifted.
   Safe temperature 145°F (63°C) internal temperature (steaks, chops and roasts)
   Tip For a golden top, switch the slow cooker to warm and let the cheese melt gradually.

After six hours, the pork should be fork-tender and the sauce slightly thickened. The cheese goes on top and melts within a few minutes, creating a creamy, golden layer. The aroma is intensely savory with sweet pineapple notes. Check that the cheese is fully melted and the pork is still hot before moving to the final phase.

Phase 3: Assemble and Serve

4. 4Char the Tortillas
   Heat a dry skillet over medium-high heat. Warm each corn tortilla for 30 seconds per side, until lightly charred and pliable. Keep them wrapped in a clean kitchen towel to stay warm.
   Look for Tortillas have brown spots and are soft and foldable.
   Tip Char in batches; stack warm tortillas in foil to keep them steaming.
5. 5Assemble and Serve
   Spoon the pork mixture into the warm tortillas. Top with diced white onion, fresh cilantro, avocado slices, and a drizzle of crema. Serve with key lime wedges for squeezing over the top.
   Look for The tortillas are piled high with tender pork, melted cheese, and fresh toppings.
   Tip Serve immediately while the cheese is still gooey.

The tortillas are charred and pliable, the pork and cheese are spooned into them, and the toppings are fresh and colorful. The final dish should look vibrant: red sauce, golden cheese, green cilantro, white onion, and creamy avocado. The key lime wedges are ready for squeezing. Everything should be served immediately while the tortillas are warm and the cheese is gooey.

Common mistakes

One common mistake is lifting the lid to check on the pork, which releases heat and extends the cooking time. Trust the timer. Another is using too much sauce—if the mixture looks overly liquid at the start, it will reduce and thicken as the pork releases its juices.

Avoid overcooking the pork to the point where it becomes stringy and dry; while the slow cooker is forgiving, 6 hours on LOW is the sweet spot for pork loin. Finally, don't skip the tortilla charring—it adds an essential smoky element.

How to tell it’s done

The pork is done when it is fork-tender—a fork inserted into the thickest piece should twist easily and the meat should pull apart without resistance.

The internal temperature of the pork should reach at least 145°F (63°C), but because it cooks low and slow, it will be well beyond that—likely around 190°F (88°C)—which is ideal for tender, shreddable meat. The sauce should be slightly thickened and the pineapple chunks soft and caramelized. The cheese on top should be fully melted and bubbly.

• Steaks, chops and roasts: 145°F (63°C) in the thickest part, then a 3-minute rest