Marco Pierre White gratin potatoes are thinly sliced potatoes baked slowly in cream with garlic and seasoning until tender, rich and golden at the edges. This straightforward French-inspired gratin relies on evenly cut potatoes and gentle heat rather than a separate cheese topping, making it a comforting side for roast meats or vegetables.
Ingredients
- 2 lb 4 oz (1 kg) floury potatoes, such as Maris Piper or russets
- 1½ cups (355 ml) heavy cream
- 1 cup (240 ml) whole milk
- 1 garlic clove, peeled and halved
- 1 tbsp (14 g) unsalted butter, softened, for greasing
- ¾ tsp (4 g) fine salt, or to taste
- ¼ tsp (0.5 g) freshly ground black pepper
- ⅛ tsp freshly grated nutmeg (about 0.2 g), optional
Instructions
- Heat the oven to 350°F (180°C). Grease a shallow 2-quart (about 1.9 L) baking dish with the softened butter. Rub the cut sides of the garlic over the bottom and sides of the dish, then discard the garlic or leave it in a corner for a stronger garlic flavor.
- Peel the potatoes and slice them evenly, about ⅛ inch (3 mm) thick. A mandoline makes consistent slices, but a sharp knife works; use a guard and keep fingertips clear if using a mandoline. Do not rinse the sliced potatoes, since their surface starch helps the cream thicken.
- Arrange the potato slices in overlapping layers in the buttered dish. Season the cream and milk with the salt, pepper and nutmeg, if using, and stir to combine. Pour the mixture evenly over the potatoes. The liquid should come close to the top layer without completely covering it.
- Set the dish on a baking sheet to catch any bubbling cream. Bake uncovered for 70–75 minutes, until the top is golden and a small knife slides easily through the center. If the top browns before the potatoes are tender, loosely cover the dish with foil for the remaining baking time.
- Let the gratin rest for 10 minutes before serving. This short rest allows the cream to settle and makes the layers easier to spoon out. It should remain hot throughout; this is a potato-and-dairy dish, so no meat or egg temperature check applies.
Tips
- Choose the right potato: Floury potatoes soften and help thicken the cream. Waxy potatoes can work, but the layers may hold their shape more firmly and the sauce may be looser.
- Keep slices even: Slices of similar thickness cook at the same rate. Thick or uneven pieces are the most common reason the center stays firm while the edges overcook.
- Adjust the dairy carefully: Heavy cream gives the richest texture. For a lighter result, replace up to half of it with whole milk; using only low-fat milk makes the gratin more likely to be thin or curdled.
- Check the center, not just the color: A browned top does not guarantee tender potatoes. Test several spots near the middle with a knife, and cover loosely if the surface is ready first.
Serving Suggestions
Serve the gratin warm as a side dish with roast chicken, beef, lamb or pork, or alongside baked fish and a crisp green salad. Its creamy richness also pairs well with simply cooked green beans, steamed broccoli or bitter leaves dressed with vinaigrette. For a generous vegetarian meal, serve it with roasted mushrooms and a salad; the gratin is substantial enough to anchor the plate.
For a neat serving, cut through the layers with a sharp knife and lift portions with a wide spatula. For a more relaxed meal, spoon it directly from the baking dish. Add fresh parsley or chives at the table if you like a little color, but avoid adding them before baking, when their flavor can fade.
Variations
Cheese-topped gratin: Sprinkle ½ cup (50 g) finely grated Gruyère or mature cheddar over the potatoes for the final 15 minutes of baking. This gives a more pronounced browned, savory crust than the simple cream-baked version.
More pronounced garlic: Finely grate one small garlic clove into the cream mixture instead of merely rubbing the dish with garlic. Use a light hand so the garlic does not overwhelm the potatoes.
Thyme version: Add 1 tsp (1 g) fresh thyme leaves to the cream. You can also tuck in a small sprig while baking and remove it before serving.
Cheese-free lighter variation: Use 1¼ cups (300 ml) heavy cream and 1¼ cups (300 ml) whole milk. The result is less rich and may take a few extra minutes to become tender, so rely on the knife test rather than the clock alone.
Storage and Reheating
Let leftovers stop steaming, then refrigerate them in a covered container within 2 hours of cooking. Refrigerated gratin keeps for 3–4 days. For longer storage, freeze in an airtight, freezer-safe container for up to 2 months; thaw overnight in the refrigerator. The potatoes may be slightly softer after freezing, and the cream can separate a little.
Reheat individual portions covered in a microwave until steaming hot throughout, or reheat a larger portion covered in a 325°F (165°C) oven until hot in the center, usually 20–30 minutes depending on its depth. Uncover for the final few minutes to refresh the top. USDA FSIS guidance is to reheat leftovers to 165°F (74°C); check the center with a food thermometer. Discard food left at room temperature for more than 2 hours.
Frequently Asked Questions
Do I need to boil the potatoes before baking?
No. Thin slices bake directly in the cream, which seasons them and forms the sauce. Parboiling can make the potatoes too soft and may cause them to break apart in the dish.
Should I rinse the sliced potatoes?
No. Leaving the surface starch on helps the cream thicken as it cooks. If you have already rinsed them, drain and dry the slices well; the sauce may simply be a little less thick.
Can I assemble the gratin ahead of time?
It is best baked soon after assembling because peeled potato slices can discolor and release moisture. If you need to prepare ahead, bake the gratin completely, cool it promptly, refrigerate it, and reheat it before serving.
Why are my potatoes still hard?
The slices may be too thick, the oven may be running cool, or the dish may be deeper than expected. Cover the gratin loosely with foil and continue baking until a knife passes easily through the center.
Can I make this without heavy cream?
You can replace some of the cream with whole milk, as in the lighter variation, but replacing all of it may leave a thin sauce. Avoid very low-fat milk, which is less suitable for long baking and can separate.
Is this gratin gluten-free?
The ingredients listed are naturally gluten-free, but check the labels on packaged dairy and seasonings if you are cooking for someone who must avoid gluten. Prevent cross-contact with utensils and surfaces that have touched wheat.
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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