Chilled noodles & peppers
For the dressing
Preheat the grill to medium. Cook the noodles in a large pan of salted boiling water until they are almost tender. Drain in a colander, run cold water through them and drain again thoroughly. Tip the noodles into a bowl, stir in the sesame oil, cover and chill.
Cook the peppers under the grill, turning them frequently, until they are blackened on all sides. Plunge into cold water, then peel off the skin. Cut in half, remove the core and seeds, and cut the flesh into thick strips. Set aside in a covered container.
To make the dressing, mix together the sesame oil, soy sauce, tahini and pepper sauce until well combined.
Pour the dressing on the noodles, reserving 1 tablespoon, and toss well. Add the reserved peppers, gently toss through the noodles and spoon on the reserved dressing. Scatter the spring onion over the top, and serve.