Put the noodles into a heatproof bowl and cover them with boiling water. Leave to soak for 6 minutes.
Meanwhile, pour the stock into a large saucepan and bring up to the boil. Add the vegetables and simmer for 5 minutes.
Drain the noodles, then add them to the saucepan with the sliced chicken. Season with pepper. Heat for 1-2 minutes, then ladle into bowls.
Serve each portion sprinkled with a few drops of soy sauce.
If you like things spicy, add a few fine slices of fresh red or green chilli, or a pinch of dried chilli flakes.
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