Cooking in
Singapore
Thai · Isaan
Gai Yang — Isaan Grilled Chicken / ไก่ย่าง
Isaan grilled chicken (gai yang) is defined by the marinade and the charcoal technique, not by the cooking alone. The marinade: coriander root, white pepper, garlic, fish sauce, palm sugar, and a small amount of dark soy — pounded together and rubbed under the skin and into the flesh, then left overnight. The chicken is spatchcocked (backbone removed) or split and pressed flat, then cooked slowly over medium-low charcoal, turned frequently, for 30–40 minutes. The result is fully cooked through, deeply golden, with caramelised skin from the palm sugar in the marinade and no burning. Served with sticky rice, som tam, and nam jim jaew.
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Cook
I
The Market List
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1 (about 1.4 kg)
Whole chicken
spatchcocked — backbone removed, pressed flat
Your own market
For the marinade
30 g
Coriander root
scraped clean, roughly chopped
8 g
White pepper
whole, freshly ground coarse in a mortar
Your own market
20 g
Garlic
peeled, roughly chopped
Your own market
30 ml
Fish sauce
Your own market
20 g
Palm sugar
shaved or grated
Origin · Indonesia
10 ml
Dark soy sauce
To serve
400 g
Sticky rice
soaked and steamed in the standard way
Origin · Thailand
1 portion
Som tam
prepared separately
1 portion
Nam jim jaew
prepared separately; the canonical accompaniment
II
The Method
1
Pound coriander root, white pepper, and garlic together in a mortar until a coarse paste forms, working until the root breaks down and releases its sharp, resinous fragrance — a smooth paste would trap the aromatics rather than distribute them through the flesh. Add fish sauce, palm sugar, and dark soy sauce; work briefly to combine. The paste should smell fiercely of coriander root with a warm, peppery back note.
From the canon — The root and lower stem of the coriander plant (Coriandrum sativum) — an aromatic that Thompson identifies as the most overlooked and underutilised Thai ingr… Coriander Root (Raak Pak Chee): The Overlooked Element →
2
Spatchcock the chicken by removing the backbone entirely; press the bird flat so it lies at an even thickness, which will allow it to grill uniformly rather than leaving the breast overcooked while the thigh catches up. Work the marinade under the skin and into the flesh on all surfaces, pushing it as deep into the thighs and shoulders as your fingers will reach. Place the chicken in a tray, cover, and refrigerate overnight — a minimum of twelve hours — so the marinade moves into the centre of the flesh rather than sitting at the surface, producing a flavour no amount of grilling can otherwise achieve. This is where the dish lives or dies: shortcuts at this stage leave a superficial seasoning that the fire cannot correct.
3
Prepare a charcoal fire to medium-low heat, letting the coals ash over completely with no naked flame, so the chicken cooks through gently without the skin scorching before the inside is done. Hold a hand 15 cm above the grate; it should be comfortable for four to five seconds. Lay the spatchcocked chicken skin-side up.
4
Grill for 30–40 minutes total, turning the chicken every five minutes so the palm sugar in the marinade caramelises gradually rather than burning against the grate before the flesh is cooked through. The skin should deepen steadily to a uniform, dark golden colour with localised caramelised patches — not blackened. Adjust the chicken's position over the coals if any area is colouring faster than the rest.
From the canon — Palm sugar — made from the sap of the palmyra palm (Borassus flabellifer) or coconut palm — is the primary sweetener of the Thai kitchen and one of the most … Palm Sugar (Nam Tan Pip): Selection and Use →
5
The chicken is done when the skin is fully caramelised and golden across the surface, the joints move freely, and any juices run clear. Rest for five minutes before jointing, so the juices that have been driven toward the centre by the heat redistribute back through the flesh and the chicken cuts cleanly.
6
Joint and serve immediately alongside sticky rice, som tam, and nam jim jaew.
From the canon — Som tam is the most eaten salad in Thailand — 40,000+ restaurants sell it in Bangkok alone — and it is entirely defined by the mortar-and-pestle technique, n… Som Tam — Green Papaya Salad Mortar Technique / ส้มตำ →
III
Quality Hierarchy
01
Reserve — A free-range, traditionally raised Thai native chicken (gai baan) with firm, flavourful flesh that holds the overnight marinade and withstands slow charcoal cooking without drying. Fresh coriander root from a market with full foliage attached — never dried.
02
Estate — A free-range chicken of good provenance; coriander root sourced fresh from a specialist Asian grocer. Palm sugar in solid cake form, shaved to order — not pre-dissolved syrup.
03
Market — A standard free-range whole chicken; coriander root and palm sugar from a well-stocked Asian supermarket. White pepper freshly ground rather than pre-ground.
04
House — A standard supermarket whole chicken; pre-ground white pepper; granulated sugar substituted for palm sugar — the caramelisation character will be less complex but the dish is still structurally sound.
IV
Sensory Tests
◇Smell. After pounding, the marinade paste carries a sharp, resinous coriander-root fragrance above the heat of white pepper — this confirms the roots have released their volatile compounds.
◇Sight. Coals are ashed over, grey-white with no naked flame — the correct medium-low heat for a 30–40 minute cook.
◇Sight. Skin colour deepens gradually to dark gold with caramelised patches; no blackening across the surface indicates the turning schedule has been maintained.
◇Touch. Joints move freely and juices run clear when the thigh joint is pressed — the chicken is cooked through without the breast having dried.
◇Where it lives or dies. The overnight marinade is not optional: coriander root must be given time to penetrate the flesh, and the combination of medium-low charcoal with frequent turning is the only method that caramelises the palm sugar without burning it before the chicken is cooked through.
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