Place the beef (making sure you’ve removed any strings it is tied together with), onion, ginger, gochujang, soy sauce, rice wine vinegar and sesame oil in the slow cooker pan and use your hands to make sure the beef is well coated in the mixture.
Pour in the beef stock, pop the lid on the slow cooker and cook on HIGH for 4-6 hours or LOW for 6-8.
When the meat is cooked and easy to pull apart, shred it with two forks. Scoop out a few spoonfuls of the cooking liquid into a small bowl and stir in the cornflour until smooth. Add the cornflour mixture back to the slow cooker, give everything a stir then cook for 30 minutes more so the sauce can thicken a little. You can do this on the hob if your slow cooker pan allows.
Meanwhile, toss the carrots and cucumber with the rice wine vinegar and a pinch of salt to pickle a little.
Serve the beef with the lightly pickled veg, rice and spring onions.
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