This makes a large quantity, so I usually do half the recipe with a small celeriac:

 

1 large Celeriac

2 large carrots

2 onions

2 pints good veg stock

Black pepper

 

Peel and roughly chop/slice the vegetables, throw into a large saucepan, add the stock.  Bring to boil and simmer until vegs are soft.  Blitz in liquidizer or with hand blender until smooth or leave a little chunkier if that's how you like it.  Season to taste. 

 

If you like a bit more creaminess, add a couple of tblspns 0 pt greek yogurt.

 

Linda