Equipment
* optional
Ingredients
Aromatics & Dairy
- 2 garlic, 1 clove halved, 1 clove minced
- 15 g unsalted butter, softened
- 300 ml heavy cream
- 300 ml whole milk
- 12 g kosher salt
- 2 g black pepper, freshly ground
- 1 g nutmeg, freshly grated
Potatoes
- 1000 g russet potato, peeled
Nutrition (per serving)
Nutrition is estimated per serving. Nutrients without complete source data are omitted.
Full nutrition
- Calories
- 354 kcal
- Protein
- 7 g
- Carbohydrates
- 35 g
- Fat
- 22 g
- Fiber
- 2 g
- Sugar
- 5 g
- Sodium
- 820 mg
- Saturated Fat
- 14 g
- Trans Fat
- 1 g
- Monounsaturated Fat
- 6 g
- Polyunsaturated Fat
- 1 g
- Cholesterol
- 67 mg
- Potassium
- 821 mg
- Calcium
- 117 mg
- Iron
- 1.6 mg
- Magnesium
- 48 mg
- Phosphorus
- 167 mg
- Zinc
- 0.8 mg
- Vitamin A
- 246 mcg
- Vitamin C
- 10 mg
- Vitamin D
- 1.4 mcg
- Vitamin E
- 0.6 mg
- Vitamin K
- 6 mcg
- Vitamin B6
- 0.6 mg
- Vitamin B12
- 0.3 mcg
- Thiamin
- 0.17 mg
- Riboflavin
- 0.23 mg
- Niacin
- 1.8 mg
- Folate
- 28 mcg
- Water
- 205 g
Sources: USDA FoodData Central
Method
Preheat the oven to 200°C/400°F. Rub the inside of a gratin dish thoroughly with the halved garlic clove to release its essential oils, then generously grease the dish with the softened butter.
Slice the peeled russet potatoes uniformly to about 3mm thick using a mandoline slicer. Do not wash or rinse the potatoes after slicing, as retaining the surface starch is critical for the sauce to emulsify and thicken.
In a large wide saucepan, combine the heavy cream, whole milk, minced garlic clove, kosher salt, black pepper, and nutmeg. Bring the mixture to a gentle boil over medium heat.
Add the sliced potatoes to the boiling liquid. Reduce the heat and simmer gently for 8 to 10 minutes, stirring occasionally with care to avoid breaking the slices. The liquid should thicken slightly as the potato starch releases.
Carefully transfer the potato and cream mixture into the prepared gratin dish, spreading the potato slices into an even, compact layer.
Bake in the preheated oven for 30 to 35 minutes until the potatoes are completely tender when pierced with a paring knife and the top has formed a deep golden brown, bubbling glaze.
Remove from the oven and let the gratin rest for 10 to 15 minutes before serving. This resting period is non-negotiable, as it allows the bubbling cream mixture to cool slightly and set into a cohesive sauce.
Chef's Notes
- The hallmark of a Michelin-level Gratin Dauphinois is the strict absence of cheese. A quality mixture of heavy cream and whole milk naturally reduces in the high heat of the oven to form a perfectly glazed, deeply savory crust.
- Never wash your potato slices. Russet potatoes are naturally high in amylose starches, which act as the sole thickening agent for the liquid. Rinsing them will result in a watery, separated sauce.
- Simmering the potatoes in the cream mixture prior to baking is a classic French restaurant trick. It kickstarts the starch release, seasons the potatoes internally, and cuts the traditional two-hour oven baking time in half.
- Do not skimp on the resting step. The sauce will appear dangerously thin immediately out of the oven, but it rapidly thickens into a rich, velvety consistency as it cools to serving temperature.
Storage
Refrigerator: 4 days — Store covered. Reheats beautifully and often tastes better the next day as flavors meld.
Reheating: Reheat in a 150°C/300°F oven until warmed through and bubbling at the edges.
Troubleshooting
Sauce is broken, watery, or separated
Cause: Boiling the dairy mixture too vigorously, using low-fat dairy, or rinsing the starch off the potatoes.
Fix: Cannot be fixed once baked, but the dish remains completely safe and delicious to eat.
Prevention: Use heavy cream and whole milk, maintain a gentle simmer rather than a rolling boil, and never wash potatoes after slicing.
Potatoes are undercooked and crunchy
Cause: Slices were cut too thick and unevenly, or the dish was removed from the oven prematurely.
Fix: Cover the dish securely with aluminum foil to prevent further browning and continue baking until the potatoes are completely tender.
Prevention: Use a mandoline slicer for consistent 3mm slices and test the center of the dish with a knife before removing from the oven.
Cultural Context
Gratin Dauphinois originated in the historic Dauphine region of south-eastern France. Traditional regional rules strictly forbid the addition of cheese, relying instead on the magical culinary alchemy of native potato starch, rich dairy, and slow cooking to create a cohesive dish with a naturally golden crust. It has been refined over decades by legendary French culinary figures, including the Troisgros family, cementing its status as an elegant standard of haute cuisine.
