Pour boiling water over noodles in a heatproof bowl and let stand for 3 to 5 minutes. Rinse in cold water and drain well. With a pair of scissors, roughly cut the noodles so they are a manageable length, and set aside.
Toast rice in a dry, heavy-bottomed frying pan until lightly golden. Grind or pound rice to a powder and set aside.
Toast dried chillies until quite smoky, then g