Polish Vegetable Soup

Cannot remember where I got this recipe originally; I (re)found it in a random doc file in my secondary drive today. Posting it here so I remember to give the recipe a go.

1 medium leek, sliced
1 carrot, sliced
1 medium onion, sliced
2 cloves of garlic, crushed
very small portion of chinese cabbage, sliced
1 small celery root, sliced
one small parsley root sliced
2 small potatoes, sliced into thin wedges
1.5 litres (or more) salted vegetable stock, or salted water
1 small pepper, sliced

Put all ingredients into pot, boil for one minute and then simmer for 20 minutes.

Take 3/4 of soup and blend in a blender, pour blended mixture back into the rest of the soup; mix well and cook for a further five minutes.