Chop mushrooms fine (save some for garnish) and simmer with onion
minutes in broth. Melt 6 T of butter in a small saucepan (different
other mixture). Add flour and stir with whisk until blended. Bring
a boil and add it to the roux (butter/flour).
Add cream, stir until thickened. Add broth and with vegetables.
before you serve, season and add sherry to taste. rich; but worth