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Peel the celeriac and cut into 1 inch cubes. Add the celeriac and leek to a largish pan, toss in oil and sweat over a gentle heat for 5 minutes
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Pour over the stock, bring to a gentle simmer and cook for 20 minutes or until the celeriac cubes are soft
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Add in the watercress and wilt for 5 minutes
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Blitz with a stick blender till you get the consistency you like. I prefer leaving in nubbles of celeriac and flecks of watercress, but you can make this soup completely smooth if you like
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Season with plenty of salt and freshly ground black pepper and serve