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Mix the turmeric, salt and 3 tbsp water in a large non-metallic dish, then add the chicken pieces. Rub all over the chicken, cover and chill overnight, or leave at room temperature for 30 mins.
Meanwhile, make the spice paste. Soak the dried chillies in hot water for 20 mins until soft. Drain, then mix the chillies and other ingredients together in a processor or blender until smooth.
Heat the oil in a deep wok or large, heavy-based saucepan. Fry the chicken in batches for 5 mins until golden, turning halfway through. Drain the chicken on kitchen paper. Carefully remove half of the oil to a heatproof container, then add the spice paste to the remaining oil in the wok.
Fry the paste for 5 mins, then return the chicken to the pan, followed by the coconut milk, lemongrass and lime leaves. Cook for a further 5 mins, then stir in the stock powder, sugar and tamarind paste. Simmer gently for 1 hr 30 mins-1 hr 40 mins until the chicken is falling off the bones.