Per serving
Celeriac gives a nutty edge to the classic champ made just with potato - ideal for St Patrick's Day
Put the potato, celeriac and garlic in a pan of cold water, place over a medium heat and cook for 20-25 mins until tender. Drain, mash, then stir in the double cream and butter.
Season to taste, stir through the spring onions and serve with a knob of butter on top.
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