If you are using a whole sole: check if the fish is gutted and washed. If you have fillets, check for any bones with your fingers. Pat the fish dry with a paper towel (it's important for the skin to be dry — this way it will brown nicely).
Description
Delicate flounder fillets with a light, velvety lemon sauce are a spring, regional take on a fish main course. The recipe combines the simplicity of Polish fish cuisine with a subtle twist: a lemon-butter sauce with cream and parsley, along with optional fresh asparagus as a seasonal side. The dish is light, aromatic (sour-buttery), and presents beautifully on the plate — golden fish skin, bright, creamy sauce, and green accents. Serve with young potatoes or barley, white wine, or a light lager beer. The recipe guides you step by step, perfect for someone making flounder for the first time.
Ingredients Used
Ingredients (13)
- Flounder 800 g
- Lemon 2.5 szt. (~200 g)
- Butter 30 g
- Sour cream 100 g
- Rapeseed oil 30 g
- Wheat flour 40 g
- Garlic 2 ząbki (~10 g)
- Potatoes 4 szt. (~600 g)
- 🌿 Przyprawy
- Salt 6 g
- Black pepper 4 szczypty (~2 g)
- Parsley 30 g
- ✨ Opcjonalne
- Asparagus 200 g
- Capers 15 g
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Preparation steps
Preparing the fish
Season the fillets on both sides with salt and pepper (use about half of the salt), then lightly dust with flour — shake gently to remove excess flour. Brush a thin layer of rapeseed oil on the skin side and gently spread it with a brush.
Additions
Prepare the potatoes: if they are small and young, scrub them and cook in salted water for 15-18 minutes until soft (check with a fork). Drain and keep warm.
Grilling fish
Preheat the electric grill, grill pan, or rack to medium-high heat (about 200°C). Place the fillets skin-side down and grill for 3-5 minutes without moving them — watch the edges: when the skin turns golden and easily releases from the grill, flip the fish and grill for another 2-3 minutes, until the flesh is opaque and easily flakes with a fork.
Lemon sauce
In a small skillet, heat the butter over medium heat. Add the finely chopped garlic and sauté for 20-30 seconds until it becomes fragrant (do not brown). Pour in the lemon juice (squeeze the lemons) and the grated zest (only the yellow part), stir and cook for 30-40 seconds to allow the raw lemon's alcoholic smell to evaporate a bit.
Reduce the heat to low and pour in the cream, stirring vigorously to combine the sauce. Cook for 1-2 minutes until the sauce thickens slightly — it should have a creamy consistency. Season with ½ teaspoon of salt (about 1-2 g) and freshly ground pepper to taste. If the sauce is too acidic, add another 5-10 g of butter.
Finishing the sauce
Remove the sauce from the heat and stir in the finely chopped parsley. Taste the sauce and gently season with salt or additional drops of lemon juice if needed — the sauce should be fresh but not overly sour.
Asparagus (optional)
If you are using asparagus: trim the tough ends, brush with a tablespoon of rapeseed oil, and grill for 2-4 minutes until slightly softened and browned. Drizzle with a bit of lemon juice.
Assembly and serving
On a plate, place a portion of young potatoes, and next to it, place the grilled flounder (skin side up or down according to preference). Drizzle the fish with hot lemon sauce just before serving. Sprinkle with finely chopped capers (optional) and parsley.
Final tips
Check the serving temperature — the fish tastes best hot, and the sauce should be slightly warm. If you are preparing it in advance, keep the fish separate, and warm the sauce over low heat and stir before drizzling.
Fun Fact
Flounder was popular in Polish seaside kitchens due to its delicate meat and ease of preparation; in the past, frying flounder in butter was one of the simpler ways to prepare a festive dinner in Kashubian homes.
Best for
Tips
Serve with young potatoes or pearl barley, slightly chilled white wine (e.g. riesling) or lager beer. Garnish with a slice of lemon and fresh parsley. If desired, add thin slices of radish for color.
Store cooked fish and sauce separately in airtight containers in the refrigerator for up to 24 hours. Gently reheat on low heat or in the oven at 120°C for a few minutes; avoid the microwave, which can dry out the fish. Do not freeze already cooked cream sauce.
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