Put chilies, ground coriander,
cumin, chili powder, garlic, onion, coconut milk and salt to taste
in a blender or food processor fitted with a metal blade and blend
until smooth.
Melt butter in a saucepan, add
mushrooms and fry for 3-4 minutes, until golden brown.
Pour over spicy coconut milk and
simmer, uncovered, for 10 minutes or until mushrooms are tender.