Remove the pan from the heat and deglaze the roux with about 200 ml of cold broth, stir the mixture with the whisk and heat it up again. Pour in the rest of the broth and the cream, stirring constantly, the soup has to simmer again and again.
When all the liquid has been added, cover and simmer the soup for another 5 minutes.
In the meantime, wash the herbs, pat dry and finely chop. Now add the herbs to the soup and let everything stand for 5 minutes.