Boil the kettle and put the noodles in a large pan or bowl. Pour over enough boiled water to cover, pushing the noodles under the water to help them soften evenly. Set aside for 5-10 mins, until the noodles are completely soft. Mix the curry powder, turmeric, sugar, sesame oil, soy sauce and 1 tbsp water in a bowl.

Heat the wok until very hot. Add the sunflower oil, onion and pepper. Stir-fry for 3-4 mins until softened and starting to brown in places. Drain the noodles and add to the pan, along with the sauce mixture and beansprouts. Stir-fry for a further 3-4 mins, tossing everything through the sauce, until hot. Adjust the seasoning with a little more soy or sugar, if you like, and scatter over the chilli, if you like more spice.