Gratin Dauphinois

Dinner

Thin slices of potato, layered in a dish rubbed with garlic, drowned in cream and milk, then baked low and slow until the top is golden and the inside is melting and rich. This is gratin dauphinois is the real one, without cheese. It's been made this way in the Dauphiné region since at least 1788, and there's a reason it hasn't changed.

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Prep Time 20 minutes mins

Cook Time 1 hour hr 30 minutes mins

Total Time 1 hour hr 50 minutes mins

Servings 6

Ingredients 

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• 1.2 kg potatoes
• 200 ml whole milk
• 300 ml Double cream
• 2 cloves garlic
• 30 gr unsalted butter
• ¼ tsp nutmeg
• salt and black pepper

Equipment

baking dish

knife

saucepan

kitchen paper

Instructions

1. Prep the potatoes

• Peel the potatoes and slice them into thin rounds, about 3mm thick. A mandoline makes this quick work, but a sharp knife and patience will get you there. The key is consistency: uneven slices mean uneven cooking.

  Important note: do not rinse the potatoes. That starchy coating is what gives the gratin its silky texture and helps bind everything together. Set them aside on kitchen paper but don't wash them.

2. Prepare the dish

• Preheat your oven to 150°C (130°C fan). Cut one of the garlic cloves in half and rub it vigorously all over the inside of your oven dish, bottom and sides. The heat of the oven will release that garlic flavour into the cream as it cooks. Butter the dish generously.

3. Infuse the cream

• Pour the milk and cream into a saucepan. Crush the remaining garlic clove with the flat of a knife and add it to the pan along with the nutmeg, a good pinch of salt and a few grinds of pepper. Heat gently until steaming and just starting to simmer, don't let it boil. Take off the heat and leave to infuse for 10 minutes, then fish out the garlic.

4. Layer the potatoes

• Arrange a layer of potato slices in the dish, overlapping them slightly like roof tiles. Season lightly with salt and pepper. Add another layer, season again. Continue until you've used all the potatoes, you're aiming for about 3-4 layers depending on your dish size.

  Pour over the infused cream mixture. It should come just to the top of the potatoes without completely submerging them. Give the dish a gentle shake to help the liquid settle between the layers.

5. Bake low and slow

• Dot the top with small pieces of butter and slide into the oven. Bake for 1 hour 15 minutes to 1 hour 30 minutes, until the top is deep golden and the potatoes are completely tender when pierced with a knife. The cream will have reduced and thickened, absorbed by the potatoes into something gloriously rich.

  If the top is browning too quickly, cover loosely with foil for part of the cooking time, removing it for the last 20 minutes to let it colour.

6. Rest before serving

• Let the gratin sit for 10-15 minutes before serving. This isn't just about not burning your mouth, the resting time allows everything to set slightly, making it easier to cut into portions that hold together rather than collapsing into a delicious heap.

Notes

• You want a variety of potatoes that’s waxy enough to hold its shape but starchy enough to absorb the cream. Maris Piper is the best all-rounder available in UK supermarkets. Charlotte works well too. Avoid anything too floury (like King Edwards) which can fall apart, or too waxy (like new potatoes) which won’t absorb the cream properly.
• Don’t rinse the potatoes: This is the single biggest mistake people make. The surface starch is essential, it combines with the cream to create that silky, unctuous texture. Rinsing it away gives you watery, separated gratin.
• Low and slow is essential: High heat makes the cream split and the top burn before the potatoes are cooked through. Keep it gentle; the long cook time is what creates the magic.
• No cheese, really: The authentic gratin dauphinois contains no cheese. If you add cheese, you’ve made gratin savoyard – delicious, but a different dish entirely.
• Make ahead: You can assemble the gratin, cover and refrigerate for up to 24 hours before baking. It’s also excellent reheated, many say it’s even better the next day.

About this recipe

The gratin dauphinois is one of France’s great regional dishes, born in the Dauphiné, the mountainous area around Grenoble that now covers the departments of Isère, Drôme, and Hautes-Alpes. It is also one of the most hotly debated dishes in French cooking, which is saying something in a country where almost every classic recipe has its defenders and its revisionists.

The first recorded gratin dauphinois

The first mention of the dish dates to 12 July 1788. It was served with ortolans at a dinner given by Charles-Henri, Duke of Clermont-Tonnerre and lieutenant-general of the Dauphiné, for the municipal officials of the town of Gap. This was just weeks after the Journée des Tuiles, a violent uprising in Grenoble considered one of the opening events of the French Revolution. The Duke had avoided a massacre by withdrawing his troops, and the dinner was something of a diplomatic gesture. The humble gratin dauphinoise, it seems, has always had a talent for bringing people together.

The gratin au dauphinois spread through the auberges of the southeast before eventually reaching Paris, where a restaurant called Le Gratin Dauphinois opened in 1930. By then, variations had already started appearing: some with eggs, some with cheese, some with stock instead of cream. The debates about which version is correct continue to this day.

The cheese question

Ask anyone from the Dauphiné and they will tell you firmly: the real gratin dauphinois has no cheese, no eggs, no onions. Just potatoes, cream, milk, garlic, French butter, and seasoning. The Académie du Gratin Dauphinois, founded in 1985 in Grenoble, defends this position with considerable seriousness, holding annual competitions where contestants must follow strict traditional rules.

The confusion with cheese often comes from the gratin savoyard, a cousin from neighbouring Savoie that uses stock and Beaufort cheese instead of cream. Equally good, but a fundamentally different dish. The gratin dauphinoise relies entirely on the natural starch of the potatoes combining with the cream to create its silky, binding texture. No cheese needed and no cheese wanted.

The technique

The secret to a proper gratin dauphinois is patience. The low oven temperature, around 150C, allows the potatoes to absorb the cream slowly, becoming tender and infused with flavour without the top burning or the cream splitting. Rush it and the cream splits, the potatoes cook unevenly, and the texture is grainy rather than silky. This is not a dish you can hurry.

The garlic matters too. A clove rubbed around the inside of the dish before the potatoes go in adds a background depth that you would notice if it were missing. The garlic does not dominate. It simply makes the gratin dauphinois recipes taste more complete.

The potatoes need to be cut thinly and consistently, ideally with a mandoline. Uneven slices mean uneven cooking, with thin pieces dissolving into the cream whilst thicker ones remain firm. A consistent 3mm thickness gives you layers that cook at the same rate and press together into that characteristic compact, sliceable gratin.

The right dish for gratin dauphinois

A gratin au dauphinois needs a dish that distributes heat evenly across the base and sides, holds the cream at a steady temperature throughout the long bake, and presents the finished gratin at the table rather than requiring a transfer to a serving dish.

I use the Staub baking dish for this. The cast iron retains heat brilliantly and distributes it evenly, which is exactly what a slow-cooked, cream-based gratin needs. The depth is right for the layers of potato, the size is correct for four generous portions, and it goes straight from oven to table looking exactly as a gratin dauphinoise should: golden on top, bubbling at the edges, and smelling of cream and garlic in a way that makes everyone at the table sit up straighter.