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1
Toast Sichuan peppercorns in dry pan 1 minute; grind to powder and set aside.
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2
Heat 1 tbsp sesame oil in saucepan; stir-fry minced pork 3 minutes until cooked (if using); add doubanjiang and cook 1 minute until fragrant.
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3
Whisk in sesame paste, remaining sesame oil, vinegar, soy sauce, garlic, and ground peppercorns until smooth; add stock and bring to simmer.
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4
Cook noodles according to package; drain and divide between bowls.
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5
Pour sauce over noodles; top with scallions, crushed peanuts, and chilli oil; serve immediately.