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1
Render the chicken skin and fat over low heat until the fat runs clear and the skin crisps. Strain and reserve the oil; discard the solids. The oil should be pale gold and carry a clean poultry scent.
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2
Combine the chicken thighs with the minced garlic, kecap manis, and light soy sauce. Cook the mixture over medium heat, turning the chicken, until the sauce reduces to a dark, lacquered glaze that clings to the meat and the fat in the pan shimmers without pooling. The chicken is done when a skewer meets no resistance at the thickest point. Rest, then slice or tear into rough pieces.
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3
Bring the chicken stock to a bare simmer. Season with salt and white pepper. The broth must remain clear and light — it is a background note, not the dominant register of the bowl. Taste: the stock should be savory but restrained.
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4
Blanch the noodles in rapidly boiling unsalted water, agitating them apart with chopsticks or tongs, until just tender with a residual bite. Drain thoroughly. This is where the dish lives or dies: noodles that carry excess water will dilute the chicken oil and kecap manis dressing and the bowl will not cohere — drain and shake the colander until no drip falls.
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5
Into each warm bowl, measure 1 tablespoon of chicken oil and 1 tablespoon of kecap manis. Add the hot drained noodles immediately and toss until every strand is evenly coated and gleams with a deep mahogany gloss.
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6
Arrange the sliced chicken topping over the noodles. Ladle the hot broth into a separate small bowl or around the noodle mound, according to preference. Add pangsit or bakso if using. Finish with sliced spring onion. Serve immediately: the noodles must still steam when they reach the table.