The soup can also be prepared in a traditional pot: just bring everything to the boil, put the lid on and simmer for 35 to 40 minutes.
To make the soup even more tasty add some wholemeal bread croutons.
You can make a very tasty variant of this soup using miso instead of vegetable broth. In this case you have to substitute vegetable broth with water, then add a teaspoon of white miso when blending the soup. You won't need to add salt because miso is salty enough.