First, wash and finely chop the herbs.
Bring milk and water to a boil, add salt and caraway seeds.
Mix flour with a little water, then stir in sour cream, a little salt and pepper. Stir into the soup to thicken and continue to boil a little more.
Cut the bread into cubes. Melt the butter in a pan and fry the bread cubes in it.
Just before serving, stir most of the herbs into the soup.
Arrange the soup and serve sprinkled with croutons and the remaining herbs.