How to Make It
In a bowl, combine the fish sauce, garlic, curry powder, salt and 1 1/2 teaspoons of the sugar. Add the chicken to coat.
In a small skillet, mix the remaining 2 tablespoons of sugar with 1 tablespoon of the water and cook over high heat, stirring, until the sugar is dissolved. Cook without stirring until a deep amber caramel forms, 2 to 3 minutes. Remove from the heat and stir in the remaining 2 tablespoons of water. Transfer to a very small heatproof bowl.
Heat a wok over high heat. Add the oil and heat until shimmering. Add the lemongrass, shallot and chiles and stir-fry until fragrant, about 1 minute. Add the chicken and caramel and stir-fry over moderate heat until the chicken is cooked through and the sauce is slightly thickened, about 8 minutes. Transfer to a bowl and top with the cilantro. Serve with rice.