Wash the potatoes under running water, do not peel if the skin is thin and nice (optionally peel if you prefer). Use a mandoline set to a thickness of 2-3 mm or a sharp knife and cutting board: slice each potato into thin, evenly thick slices (2-3 mm). After slicing, place the slices in a large bowl of cold water and rinse several times until the water becomes less cloudy (about 1-2 minutes) — this will remove excess starch and prevent sticking during baking. Drain and dry the slices on a clean paper towel.
Description
A delicate, creamy potato gratin with a Polish twist: creamy sour cream, aromatic garlic, and fresh thyme, along with baked yellow cheese, create a hearty yet elegant main dish. The inspiration from modern Polish cuisine lies in the simplicity of ingredients available in spring and precise execution: thinly sliced potatoes soak up the cream-based sauce thickened with potato starch, resulting in a velvety texture without the use of flour (gluten-free). Serve as a standalone dish or as a side to roasted meat (duck, pork) or in a vegetarian version with green vegetables. The dish is golden and creamy, with a contrast of crispy, slightly browned cheese crust and herbal aromas.
Ingredients Used
Ingredients (12)
- Potatoes 6.7 szt. (~1000 g)
- Cheese 200 g
- 18% cream 300 ml
- Milk 100 ml
- Garlic 2 ząbki (~10 g)
- Butter 30 g
- Potato starch 10 g
- 🌿 Przyprawy
- Salt 0.1 szczypt (~4 g)
- Black pepper 4 szczypty (~2 g)
- Thyme 6 g
- ✨ Opcjonalne
- Asparagus 200 g
- Spring onion 1.2 pęczek (~60 g)
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Preparation steps
Preparing the potatoes
Cream sauce
In a medium saucepan, melt the butter over medium heat. Add finely chopped or crushed garlic and sauté for 30-45 seconds until fragrant (do not brown) — it should be aromatic, not burnt. Add fresh thyme and briefly stir. Pour in the cream and milk, and mix. In a separate bowl, dissolve the cornstarch in 2 tablespoons (about 30 ml) of cold milk until a smooth paste forms; pour it in a thin stream into the hot cream while continuously whisking. Gently heat for 3-4 minutes until the sauce slightly thickens and no longer tastes raw. Season with salt and pepper to taste. The finished sauce should lightly coat a spoon and have a velvety, smooth consistency.
Preparing the dish
Preheat the oven to 190°C (top-bottom; if using a convection oven set to 170°C). Grease a baking dish measuring about 20x30 cm or a round pan with a diameter of 24 cm with butter. You can also line the bottom with a thin layer of cheese to prevent sticking and add flavor.
Arranging and baking
Arrange the potato slices in the dish in slightly overlapping layers: place the first thin layer of slices, sprinkle lightly with salt (distribute evenly), then pour 1/4 of the prepared sauce and sprinkle with 1/4 of the grated cheese. Repeat these layers until all ingredients are used up, finishing with a layer of sauce and the remaining cheese on top. Cover the dish with aluminum foil (not tightly, leave a slight opening for steam to escape) and place it in the preheated oven. Bake covered for 25 minutes, then remove the foil and bake for another 12-15 minutes until the top is golden brown and the cheese forms a golden crust. After the total baking time, check the dish with a toothpick or knife — it should easily go into the potato (about 2-3 mm of resistance).
Additions (optional)
If you are using asparagus: trim the tough ends (about 2-3 cm), blanch the stalks in salted boiling water for 2-3 minutes until they are tender-crisp, then immediately transfer to cold ice water, dry, and place on top of the casserole in the last 8-10 minutes of baking to lightly brown. Finely chop the spring onion and sprinkle it over the finished dish just before serving for freshness and color.
Finishing and serving
After removing from the oven, let the casserole sit for 10 minutes — the sauce will thicken slightly, making it easier to portion. Serve on warm plates after portioning. You can add a few fresh thyme leaves or sprinkle with finely chopped green onions. The dish pairs wonderfully with roasted meat or a green salad with vinaigrette.
Fun Fact
Gratin comes from French cuisine, but potato casseroles — in various versions — have been used in Polish homes for a long time; replacing flour with potato starch is a simple way to maintain the traditional creamy sauce effect in a gluten-free version.
Best for
Tips
Serve the gratin slightly warm, rested for 8-10 minutes. It pairs well with a tangy salad of napa cabbage or fresh lettuce with apple cider vinegar. For a festive version, serve with slices of roasted duck or roasted pork loin.
Store in the refrigerator for up to 2 days in a closed container. To reheat, bake in the oven at 160-170°C for 10-15 minutes until the inside is heated through and the cheese is slightly melted. Repeated reheating of creamy casseroles is not recommended.
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