This Root vegetable gratin is a creamy and rich recipe, which is made with sweet parsnips and earthy beetroots. It’s the ultimate comfort food recipe, a luxurious and beautiful side dish perfect for a Sunday roast or a holiday meal.
Root vegetable gratin Ingredients
A simple, elegant combination for a decadent and colorful side dish.
- 500g parsnips
- 500g beetroots
- 300ml double cream
- 200ml crème fraîche
- 4 cloves of garlic, whole and unpeeled
- ½ a bunch of fresh rosemary (about 4-5 sprigs)
- 2 oranges
- 1½ teaspoons of sea salt
- A big pinch of black pepper
- Unsalted butter, for greasing
How To Make Root vegetable gratin
A step-by-step guide to this incredibly rich and flavorful vegetable bake.
- Prep the Oven and Vegetables: Preheat the oven to 200ºC/400ºF/gas 6. Generously grease a 1.5-litre baking dish. Scrub the parsnips and beetroots well (no need to peel if the skins are good) and thinly slice them. A mandoline is perfect for this, but a sharp knife will also work.
- Layer the Vegetables: Arrange the sliced parsnips and beetroots in alternating, overlapping layers in the prepared baking dish.
- Infuse the Cream: In a saucepan, combine the double cream, crème fraîche, whole unpeeled garlic cloves, and the rosemary sprigs. Bring the mixture to a gentle simmer, then immediately take it off the heat.
- Finish the Sauce and Assemble: Finely grate the zest of the oranges into the warm cream mixture. Season with the salt and a big pinch of black pepper.
- Bake Covered: Pour the infused cream over the vegetables in the dish, gently pressing them down to submerge them in the liquid. Arrange the rosemary sprigs from the pan on top. Cover the dish tightly with tin foil and bake for 40 to 45 minutes, until the vegetables are almost tender.
- Bake Uncovered and Serve: Remove the foil and bake for a further 20 to 25 minutes, until the top of the gratin is set, bubbling, and browning at the edges. Let it cool for about 5 minutes before serving.

Recipe Tips
For the creamiest, most perfect root vegetable gratin.
- How to get perfectly thin, even slices? A mandoline slicer is the best tool for this job. It ensures all your vegetable slices are the same thickness, which helps them to cook evenly and create beautiful, distinct layers. Remember to always use the safety guard!
- Why not peel the garlic? Infusing the cream with whole, unpeeled garlic cloves imparts a gentle, sweet garlic flavor without the harshness of raw garlic. The cloves will become soft and sweet, and you can either remove them or leave them in.
- Can I make this ahead of time? Yes, this is a great make-ahead side dish for a special occasion. You can assemble and bake the gratin completely, let it cool, and store it covered in the refrigerator. Reheat it, covered with foil, in a 180°C/350°F oven for about 20-25 minutes, until hot and bubbly.
- Why cover with foil for the first bake? Covering the gratin with foil traps the steam, which is essential for cooking the root vegetables all the way through until they are tender. The final bake without the foil is to brown the top and evaporate any excess liquid.
What To Serve With Root vegetable gratin
The perfect main courses to pair with this rich and decadent side.
This luxurious gratin is a standout side dish for any special meal. It pairs wonderfully with:
- A simple roast chicken or turkey
- Pan-seared steak or a beef roast
- Roasted pork loin or lamb chops
- As a rich vegetarian main course with a simple green salad.
How To Store Root vegetable gratin
Keeping your delicious leftovers creamy.
- Refrigerate: Store any leftovers in an airtight container or covered tightly with foil in the refrigerator for up to 4 days.
- Reheat: For the best results, reheat the gratin in a 350°F oven for 15-20 minutes, until warmed through and bubbly.
Root vegetable gratin Nutrition Facts
An estimated guide per serving.
- Calories: 480 kcal
- Carbohydrates: 25 g
- Protein: 6 g
- Fat: 40 g
Nutrition information is estimated and may vary based on ingredients and cooking methods used.
FAQs
Can I use different root vegetables?
Absolutely. This recipe would be fantastic with a mix of potatoes, sweet potatoes, or celeriac in place of or in addition to the parsnips and beetroot.
My gratin seems watery after baking. What can I do?
If the sauce seems a bit thin, it may just need a few more minutes in the oven, uncovered, to reduce. Also, letting the gratin rest for 5-10 minutes after it comes out of the oven is a crucial step that allows the sauce to thicken and set up properly.
Can I use a different herb?
Yes. While rosemary is a classic and robust pairing with root vegetables, fresh thyme would be an excellent substitute.
Try More Recipes:
- Beetroot & lemon houmous Recipe
- Apricot & root veg cake with honey yoghurt icing Recipe
- Beetroot curry Recipe
Root vegetable gratin Recipe
Course: DinnerDifficulty: Easy8
servings20
minutes1
10
minutes480
An elegant and incredibly rich side dish featuring thin layers of sweet parsnips and earthy beetroots, baked until tender in a creamy, garlic and rosemary-infused sauce.
Ingredients
500g parsnips, scrubbed and thinly sliced
500g beetroots, scrubbed and thinly sliced
300ml double cream
200ml crème fraîche
4 cloves of garlic, unpeeled
½ a bunch of fresh rosemary
Zest of 2 oranges
1½ tsp sea salt & black pepper
Unsalted butter, for greasing
Directions
- Preheat oven to 200ºC/400ºF. Grease a 1.5-litre baking dish.
- Layer the thinly sliced parsnips and beetroots in the dish.
- In a saucepan, gently bring the cream, crème fraîche, whole garlic cloves, and rosemary sprigs to a simmer.
- Remove from the heat. Stir in the orange zest, salt, and pepper.
- Pour the infused cream mixture over the vegetables in the dish, pressing them down.
- Cover the dish tightly with tin foil and bake for 40-45 minutes.
- Remove the foil and bake for another 20-25 minutes, until the top is golden brown and bubbly.
- Let it rest for 5 minutes before serving.
Notes
- A mandoline slicer is the best tool for getting uniform, thin vegetable slices that will cook evenly.
- Infusing the cream with whole garlic cloves and rosemary sprigs adds a wonderful, subtle flavor without being overpowering.
- This gratin is a perfect make-ahead dish for a dinner party or holiday meal.
- The beautiful pink color from the beetroots makes this a visually stunning side dish.