M got this recipe from a Swedish site, but fortunately Google translated it pretty nicely. Nell took the photos!
6 medium potatoes
2 yellow onions
1 pc large leek
1 liter vegetable broth
2 cups cream
1 pinch salt
1 pinch pepper
First, peel and cut the potatoes. Clean the leeks, and cut into strips. Finely chop onions. Save a little leek to garnish the soup.
Using butter and olive oil, fry potatoes and onions in the big soup pot. Let everything soften in the pan.
Add vegetable broth – start with about 9 cups to see how the consistency is. Boil gently for 15 minutes or so. Put in blender and mix to desired consistency.
Then pour in the cream and boil lightly for a few minutes. Season with pepper and salt. If the soup is too thick, dilute it with a little bit of water, cream, or broth.
Garnish the soup with saved leeks.