Gratin Dauphinois de la Poêle au Four
Gratin Dauphinois de la Poêle au Four·(grah-TAN doh-fin-WAH)
La Cuisine de Grand-Mère: The Sunday Pots
It is arguably the most misunderstood French dish in America. Restaurants love to bury it under a suffocating blanket of melted Gruyère, but a true grandmother of the Dauphiné region will tell you that the authentic gratin relies on a much simpler, more profound alchemy: potato starch naturally thickening a simmering bath of garlic-infused cream. By pre-cooking the potatoes in a cast-iron skillet directly on the stove, you bypass hours of oven time and ensure the dairy never breaks. It is an unpretentious, deeply comforting masterpiece of rural ingenuity, and utilizing this stovetop-to-oven trick makes it entirely doable on a busy weeknight.
Ingredients
- garlic1 small clove
- unsalted butter1 tbsp
- Yukon Gold potatoes2 1/2 lb
- whole milk2 cup
- heavy whipping cream2 cup
- garlic2 med cloves
- Kosher salt1 1/2 tsp
- black pepper1/2 tsp
- nutmeg1/2 tsp
Method
- 01
Preheat the oven to 350°F and prepare the cast-iron skillet.
Vigorously rub the cut side of the halved garlic clove all over the inside of a large, oven-safe cast-iron skillet to release its aromatic oils, then discard the garlic halves and generously grease the skillet with the softened butter.
- 02
Slice the peeled potatoes into thin rounds but do not wash them.
Using a mandoline or a very sharp chef's knife, slice the potatoes to about 1/8-inch thickness. Do not rinse or soak them in water under any circumstances, as retaining the natural surface starch is the non-negotiable secret to thickening the sauce.
- 03
Bring the milk, cream, minced garlic, and spices to a gentle simmer.
In a large saucepan or directly in your cast-iron skillet if it is large enough, combine the milk, heavy cream, minced garlic, salt, pepper, and freshly grated nutmeg over medium heat, taking care not to let it boil over.
- 04
Simmer the unwashed potato slices in the dairy to release their starch.
Gently slide the potatoes into the simmering liquid, lower the heat, and let them cook for 10 to 15 minutes, stirring occasionally and very gently with a wooden spoon. You will see the liquid magically thicken into a velvety sauce.
- 05
Transfer the mixture to the prepared skillet and bake uncovered for 35 to 45 minutes.
If you pre-cooked in a separate pot, pour the potatoes and all the thickened cream into the garlic-rubbed cast-iron skillet, pressing them down lightly to ensure they are submerged. Transfer directly to the oven until the potatoes offer zero resistance to a paring knife and the top is deeply golden brown and bubbling.
- 06
Let the gratin rest for 10 to 15 minutes before serving.
This resting period is crucial; it allows the potato starch to set and stabilizes the sauce so it remains thick and creamy rather than runny when scooped.
Notes
Resist the urge to add cheese.
Authentic Gratin Dauphinois relies entirely on the caramelization of potato starch and dairy fat to create its signature golden crust, allowing the subtle, earthy flavors of the potato and garlic to shine without being smothered.
Starch is your thickening agent.
Washing or soaking the sliced potatoes flushes away the surface starch. Without it, the sauce will fail to bind and the dairy will separate into a watery pool.
From Cook French in America.