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Mix all the ingredients except the chillies to a loose paste. Slit open the chillies, take the seeds out using a teaspoon, then fill the centres with the mix. Pack it in tightly and seal each one with a toothpick.
Make the sauce: heat the oil and add the curry paste. Reduce the heat and fry the paste gently until fragrant, about 2 mins. Add the sugar and the fish sauce, then increase the heat and cook for 5 mins, stirring all the time. Add the coconut milk and bring to the boil, then add 100ml water and stir well.
Drop in the stuffed chillies and reduce the heat to a simmer. Cover and cook for 10 mins. Take from the heat and serve. Can be made up to a day ahead and gently reheated.