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Cut the pork shoulder into chunks that will fit into your pressure cooker.
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In a small bowl combine the oregano, cumin, cayenne, coriander, cinnamon, and salt. Rub the spice mix over the chunks of pork and set aside.
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Pre-heat the pressure cooker using the BROWN/SAUTE setting. Add the oil to the pressure cooker and sauté the onions, garlic, and Jalapeño peppers for a few minutes.
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Place the pork chunks in the cooker and pour in the beef stock. Cut the oranges in half and squeeze the juice into the cooker and toss the squeezed orange halves into the cooker as well.
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Pressure-cook on HIGH for 55 minutes.
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Let the pressure drop NATURALLY and carefully remove the lid. Remove the pork to a resting plate and let it rest for 10 minutes. Using two forks, shred the pork chunks completely.
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Remove the orange halves from the cooker and skim the fat off the liquid in the pot. Reset the cooker to the BROWN/SAUTE setting and let the sauce reduce to about 1¼ cups.
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To serve the carnitas, heat a skillet over medium-high heat. Add a little oil to the skillet and fry the shredded pork in batches until it has a few crispy parts. Pour some of the sauce over the crispy pork to moisten to taste.
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Serve the pork in taco shells or flour tortillas with your favorite toppings. Drizzle some additional sauce on top if desired.