Heat the oil in a preheated frying pan or wok over medium to high heat. Add the onion, chilli and pepper and cook for 1 minute. Add the chicken and cook for 3 minutes or until browned. Add the pumpkin and fish sauce, cover and cook for 3–4 minutes, stirring occasionally, until the pumpkin is just soft. Stir through the basil and serve with steamed jasmine rice. Serves 4.