Soak the mushrooms in 1/4 litre of water for ten minutes. Cut bamboo into slices, tofu into lozenges. Let the tofu steep in oyster sauce for 20 minutes. Cut the mushrooms into pieces. Cook for 15 minutes with soaking water and bamboo.
Take it out, collect the liquid. Cook the pasta in boiling salted water for three minutes. Score chillies lengthwise, remove seeds and cut into fine rings. Chop lemon grass finely. Heat both oils together.
Fry the prepared ingredients thoroughly. Add 100 millilitres of collected cooking water, cover and cook over a low heat for five minutes. Season to taste with oyster sauce. Sprinkle with chopped coriander green.