Soup: make a light roux with butter and flour, cool and pour in hot soup, boil and add white wine and cheese – simmer briefly and add the cream.
Dumplings:
Stir butter until fluffy, add breadcrumbs, eggs, flour and smoked trout – form dumplings and place in boiling salted water – steep for 15 minutes.
Sprinkle the soup with fresh chervil leaves and put the dumplings in.