Mix the flour, water and salt together until shaggy in texture. Knead until smooth and elastic. Shape into a round and cut into 8 even pieces. Cover and rest at room temperature for 3 hours.
Make the chilli oil sauce by heating all ingredients in a small saucepan until cooked.
Roll out the dough pieces, press them with a rolling pin to form a depression, stretch them out thin, and cook in boiling water for 1 minute.
Pour the hot chilli oil sauce over the cooked noodles and serve.