Celeriac Potato Gratin


Prep time: 
30 minutes
Cooking time: 
120 minutes


Bring celeriac and potato together in this warming and hearty dish that will round out any good supper.


  • 1 head of celeriac, approximately 350g raw prepared weight
  • 3 medium potatoes, approximately 350g raw prepared weight
  • 1 clove of garlic, crushed with the back of your hand
  • 2 shallots
  • 500ml double cream
  • 100ml vegetable stock
  • Salt and Freshly ground black pepper
  • Sprig of thyme + 1tsp finely chopped thyme leaves
  • One bay leaf
  • 30g butter


  1. Preheat the oven to 150°C and grease an oven dish. This recipe uses a 2lb loaf tin, lined with parchment paper, however you can use a shallower and wider dish, please remember to adjust the cooking time accordingly, the cooking times for this recipe is for making the gratin in a loaf tin.
  2. Pour the cream, stock, bay leaf, garlic, sprig of thyme and seasoning into a medium saucepan. Bring tot he boil and simmer for 5 minutes. Turn the heat off and leave the cream to infuse for 20 minutes.
  3. Peel the shallots and slice into rings. Heat a non-stick frying pan with the butter and saute the shallots until golden, add seasoning and the chopped thyme.
  4. Peel the celeriac and potatoes, cut the celeriac into quarters. Using a sharp mandolin slice the celeriac and potatoes 2mm thick.
  5. Season the sliced celeriac and potato generously with salt and freshly cracked black pepper
  6. Bring the cream back to the boil and the infused cream through a fine sieve directly over the sliced potatoes and celeriac.
  7. Start layering your gratin, first pour on a bit of cream, then layer the celeriac, then a thin layer of the sauteed shallots, then potatoes then cream and continue until all the ingredients are used. At this stage give it a good press with your hands.
  8. Let the gratin sit for 30 minutes before cooking.
  9. Bake the gratin for 2 hours (this timing is for a deep gratin in a loaf tin). If you're make a flatter version then the cooking time should be at least 30 - 40 minutes less. Test if the potatoes and celeriac are cooked by inserting a metal skewer, if it glides in and out with ease it's cooked, if it feels a bit crunchy return to the oven and cook longer. Do not be tempted to turn the heat up before the gratin is cooked, as a high heat will curdle the cream and your potatoes will be raw, not good!
  10. Let the gratin rest and before you are ready to serve place the gratin in a preheated oven at 200°C for 20 - 25 minutes to heat through and brown.
Photo Credit: Jonny Hughes @jonny2love
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