Recipe: Sweet potato, celeriac, parsnip & potato gratin

Adelaide Central Market shares with FIFTY+SA their comforting and indulgent recipe for sweet potato, celeriac, parsnip & potato gratin.


  • 60 g melted butter
  • 3/4 cup sour cream
  • 1/2 cup chicken consommé
  • 1 medium brown onion peeled & finely sliced
  • 1 clove garlic peeled crushed
  • 2 tsp lemon thyme leaves
  • 1/4 tsp nutmeg
  • Sea salt and freshly ground black pepper
  • 150 g sweet potato, peel & thinly sliced
  • 150 g celeriac, peeled & thinly sliced
  • 150 parsnip, peeled & thinly sliced
  • 150 potato, peeled & thinly sliced
  • 1 cup fresh sourdough breadcrumbs
  • 2 tsp chopped parsley
  • 1/3 cup (25g) finely grated Parmesan


  1. Preheat oven to 190°C (170°C fan-forced).
  2. Brush a 1 1/2 litre capacity ovenproof dish with 20g butter.
  3. Place the sour cream, consommé, onion, garlic, thyme, nutmeg, salt & pepper together in a small saucepan over medium heat.
  4. Bring to the boil, cook for 2 minutes & remove from the heat. Cover surface with plastic wrap & leave to stand for 15 minutes.
  5. For the topping, place the breadcrumbs, remaining butter, parsley & parmesan together in a bowl & mix until well combined. Set aside.
  6. Bring a large saucepan of water to the boil, blanch the root vegetable slices in batches for 2 minutes each & refresh in cold water. Make sure you keep each root vegetable separate.
  7. Place a layer of the blanched root vegetables followed by a tablespoon full of the cream mixture. Repeat the process until all the root vegetable slices have been used.
  8. Pour over remaining cream mixture & sprinkle with the breadcrumb topping.
  9. Bake in preheated oven for 1 hour, or until the gratin is bubbling & golden.

Three ways with root vegetables:

  1. For a hearty soup, cook 1 chopped onion, 1 red chilli, 1 teaspoon each of ground cumin & coriander with 1 tablespoon olive oil in a large saucepan until soft. Add 1kg peeled chopped mixed root vegetables (eg. sweet potato, carrots & parsnip), 1/3 cup dried red lentils & 1 1/4 litres vegetable stock. Bring to boil & cook for 30 minutes or until vegetables are tender & lentils are soft. Add a handful of coriander leaves, puree with a stick blender until smooth & season with salt & pepper.
  2. For roast veggies, toss 2kg peeled & chopped mixed root vegetables (eg. parsnips, carrots, beetroot, sweet potato & celeriac) with 1/3 cup mixed herbs (lemon thyme, rosemary, sage), 4 cloves garlic, salt & pepper, until well coated. Divide between 2 baking trays and roast at 200°C for 45 minutes or until tender & golden.
  3. For a mash with a difference steam or boil 1kg of mixed root vegetables (eg. potato, celeriac, parsnips & swede) until tender. Drain well, then mash until smooth. Add 40g butter, 1/4 cup milk & season well with salt & pepper, stirring until well combined.

Adelaide Central Market


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    Made up of a small, tight knit team of writers and contributors who are passionate about all things FIFTY+ and the New Age. We love Adelaide and wider South Australia and sharing with you all of the l...


We would like to acknowledge the Kaurna people as the custodians of the lands and waters of the Adelaide region.

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