Clean and wash the spinach. Peel garlic and onion, dice finely. 1⁄2 Heat up a teaspoon of oil. Fry garlic and onion until transparent. Add the spinach and cover and let it collapse. Season to taste with salt, pepper and nutmeg.
Wash the fish and dab dry. Season with salt and pepper. Sprinkle with lemon juice. Fill spinach into a small casserole dish. Fry the fish in 1⁄2 tsp. oil from each side briefly. Place on the spinach.
Bake in the preheated oven (electric oven: 175 °C/ convection oven: 150 °C/gas: level 2) for about 20 minutes.
Wash the tomato and dice finely. Mix with oregano and cheese. After about 10 mi-nutes spread on the fish and bake. Eat the bread roll with it.