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1
Heat the oil in a heavy pot over medium heat. Add the garlic, onion, and ginger — all together — and sauté until the onion softens and the ginger is deeply fragrant, its sharp raw edge giving way to something rounded and warm.
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2
Add the chicken pieces and turn them in the aromatics until the skin colours lightly on all sides. The skin should release its fat; the pot should smell of chicken and ginger together.
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3
Pour in the water and bring to a simmer. Maintain a gentle, uncovered simmer until the chicken is tender and the broth runs clear and golden. The collagen from the bones will give it a faint, lip-coating body. This step is where the dish lives or dies: if the ginger is insufficient, no later addition will save it — the broth must be assertively, unmistakably ginger-forward before anything else is added.
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4
Add the green papaya or chayote and cook until the pieces turn translucent and yield to gentle pressure without collapsing. The broth should remain clear throughout.
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5
Season with fish sauce. Taste: the broth should carry ginger warmth, clean chicken, and a salt-umami depth. Adjust fish sauce as needed.
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6
Remove the pot from the heat, add the moringa leaves, and stir once. They require only seconds; they are done when they are bright, vivid green. Olive-coloured leaves signal overcooking and the step has failed.