Rinse the flounder fillet and pat it dry with a paper towel to remove excess moisture. Peel the potatoes, rinse them, and slice them very thinly. If the baking paper is thin, it’s better not to use it; instead, simply grease the baking dish or tray with olive oil and lay out the sliced potatoes. Lightly salt the potatoes.Place the sea flounder fillet on top of the potatoes. Sprinkle the fish with breadcrumbs (photo 1). Then, sprinkle with lemon zest and drizzle with lemon juice. Add a little salt to the fish. Sprinkle both the fish and potatoes with freshly ground black pepper and oregano.
Finally, drizzle the fish and potatoes with olive oil (about 2-3 tablespoons). Place the flounder fillet with potatoes into the oven (photo 2). Bake for 20 minutes at 200°C. The baking time can be slightly increased by 5-7 minutes, and during this time, the temperature can be raised to 215°C if you want the fish to brown more (photo 3).