Fry (sauté) the onion in two-thirds of the oil for 3 minutes until
softened but not browned. Add the remaining
ingredients except the rice and parsley.
Bring to
the boil, reduce the heat and simmer for about 15
minutes until the mushrooms are cooked and the
liquid is reduced and thickened.
Remove the bouquet garni sachet, taste and re-season if necessary.
Leave to cool, then chill.
Meanwhile, cook the rice
in plenty of boiling salted water until just tender.
Drain, rinse with cold water and drain again.
Make
nests of the rice on serving plates. Spoon the
chilled mushrooms in the centre and sprinkle with
the chopped parsley.