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1
Place the scallion lengths, neutral oil, and sesame oil together in a cold wok or saucepan — do not pre-heat the vessel. Set over low-medium heat. The scallions will begin to release moisture and the oil will start to sizzle and bubble gently. The cook knows this stage is proceeding correctly by the sound: a steady, low, liquid bubbling, not a fierce fry.
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2
Reduce to low heat and continue cooking for 20 to 30 minutes without rushing. This is where the dish lives or dies: the scallions must shed all their moisture and pass through green, then golden-brown, then caramel-brown — completely wilted and beginning to crisp at the edges. Underdeveloped scallions yield a raw, grassy oil; scorched scallions yield a bitter one. The colour of deep caramel and the nutty-sweet fragrance rising from the pan are the twin signals that the oil is ready.
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3
Strain the oil through a fine-mesh sieve into a clean bowl. Reserve both the scallion oil and the caramelized scallion shreds separately. The oil should be a clear amber-gold; the shreds should be dark, collapsed, and slightly crisp to the touch.
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4
Cook the noodles in a large pot of boiling water according to their type. Drain thoroughly — the noodles should feel dry to the hand, not slick with surface water, which would dilute the dressing.
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5
Into each warmed serving bowl, measure 2 tbsp scallion oil, 1 tbsp dark soy sauce, 1 tbsp light soy sauce, and a pinch of sugar. Add the hot drained noodles and toss vigorously until every strand is coated. The noodles should glisten uniformly — no pale, undressed strands visible.
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6
Scatter the reserved caramelized scallion shreds over each bowl and serve immediately. The finished dish should carry a pronounced savoury-sweet fragrance and the noodles should taste deeply of scallion, soy, and sesame in balance — no single element dominating on the palate.