Step 1: To make marinade and cooking sauce, combine all ingredients in a jug and whisk until well combined, reserving half of the mixture and then transfer the remaining mixture to a medium bowl and add pork and toss to combine and then chill for 15 minutes.
Step 2: Place noodles into a large heatproof bowl. Cover with boiling water and stand for 30 seconds to refresh and then drain and set aside.
Step 3: Heat 1 tablespoon oil in the wok over high heat and stir-fry pork, in 3 batches (adding extra oil if necessary) for 2-3 minutes until golden and just cooked through and transfer to a plate between each batch.
Step 4: Heat 1 tablespoon oil in the wok over high heat and add chilli, green onions, garlic and choy sum stems and stir-fry for 1 minute.
Step 5: Add pork, choy sum leaves, noodles and reserved sauce and gently toss to combine until hot.
Step 6: Sprinkle with sesame seeds and serve with sliced red chilli.
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