Peel and quarter the onion. Peel, wash and cut the parsley root into pieces. Clean, wash and also chop the leek. Boil up vegetables, stock and wine. Add juniper berries, bay leaf, chervil and rosemary.
Season with salt and let it boil down for about 20 minutes. Drizzle trout fillets with lemon juice. Season with salt and pepper and simmer in the slightly simmering stock for 8-10 minutes. Melt the fat for the sauce.
Add flour and sweat while stirring. Gradually add the stock and stir well. Season sauce with salt, pepper and lemon juice. Let it swell for about 10 minutes at low heat. Whip cream until stiff.
Cut cress leaves from the stems. Add cream and cress to the sauce just before serving. Arrange two trout fillets each with the sauce on a plate. Garnish with dill and pink berries.
Boiled potatoes tossed in dill butter taste good with it.