01 -
Over medium heat, melt butter in a large pot. Toss in the onions and mushrooms, stirring every so often, until the onions turn soft—roughly 8 minutes.
02 -
Pour in the broth and wine, then mix in the herbs, paprika, Worcestershire, and salt. Bring to a boil, then lower to simmer for 10 minutes, letting the liquid cook down by about one-third.
03 -
Blend the flour into the milk until it’s smooth and lump-free. Stir this mixture into the soup and let it simmer for another 10 minutes, giving it time to thicken up.
04 -
Using a low flame, slowly blend in the sour cream and lemon juice, mixing until everything combines nicely.
05 -
Ladle the soup into bowls, and if you like, sprinkle some parsley on top before serving.