Put the pork shoulder into the slow cooker and add the onion.
Squeeze over the limes and orange and put the squeezed fruits around the pork.
Sprinkle over the salt, cumin, oregano and a generous sprinkle of pepper.
Put the lid on and cook on HIGH for 7-8 hours or LOW for 11-12 hours, or until the meat breaks apart very easily with a fork.
When the meat is cooked, lift it out of the juices (don't throw them away!) and shred it into chunks. Put them onto a grill-proof baking sheet.
Put the meat under a hot grill for about 5-10 minutes, turning once or twice, until some of the 'prickly' bits are crispy and charred.
Discard the fruit from the cooking liquid and put the crunchy pork back in and stir through the liquid.
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