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- Preheat your oven to 375°F (190°C). Grease a baking dish with vegetable oil and set aside.
- In a large saucepan, melt the butter over medium heat. Add the sliced leeks and sauté until they are soft and translucent, about 5-7 minutes.
- Stir in the flour and cook for another 1-2 minutes, stirring constantly, to create a roux.
- Gradually whisk in the milk and water, stirring constantly to prevent lumps from forming. Cook the sauce until it thickens and coats the back of a spoon, about 5-7 minutes.
- Stir in the cream and season the sauce with salt and pepper to taste. Remove the saucepan from the heat and set aside.
- In a large mixing bowl, whisk the eggs until well beaten. Gradually pour the warm sauce into the eggs, whisking constantly, to temper them and prevent curdling.
- Layer half of the sliced potatoes in the prepared baking dish, overlapping slightly. Pour half of the egg and sauce mixture over the potatoes, spreading it out evenly with a spatula.
- Repeat the layering process with the remaining potatoes and sauce mixture.
- Sprinkle the grated cheese evenly over the top of the potato and leek mixture.
- Cover the baking dish with aluminum foil and bake in the preheated oven for 45 minutes.
- Remove the foil and bake for an additional 15-20 minutes, or until the top is golden brown and bubbly, and the potatoes are tender when pierced with a fork.
- Once cooked, remove the Creamy Potato and Leek Gratin from the oven and let it rest for a few minutes before serving.
Tips for Success:
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