Cook the pasta in boiling salted water for about 8 minutes until al dente
Clean and wash spring onions and cut them into coarse rings. Wash fish fillet, dab dry and cut in half. Sprinkle with lemon juice and season
Heat the oil in a coated pan. Fry the fish fillet for about 2 minutes on each side. Take out and put aside
Sauté the spring onions in hot frying fat. Add milk and bring to the boil. Stir in sauce thickener and simmer for about 2 minutes. Season to taste with salt and pepper. Drain the pasta and mix with the sauce. Distribute in a casserole dish
Wash the tomato, cut into thick slices and place them on the pasta. Place the fish fillet and lemon wedges on top. Bake everything in the preheated oven (electric cooker: 225 °C/circulating air: 200 °C/gas: level 4) for approx. 10 minutes