Brush the mussels well under cold running water, removing any "beards". Sort out opened mussels
Wash and chop the parsley. Bread may be crushed and finely grated. Mix with 5 tablespoons of oil, parsley, salt and pepper. Peel and chop onions and garlic
Heat 3 tablespoons of oil. Fry half onions and half garlic. Sauté the tomato paste in it. Deglaze with chunky tomatoes. Season to taste with salt, pepper and sugar. Let it thicken for 5-10 minutes
Heat 2 tablespoons of oil in a large saucepan. Fry the rest of the onions and garlic in it. Mussels, wine and
Add 1/2 l water, bring to the boil. Cover and cook for 8-10 minutes. Shake the pot in between
Grate cheese. Drain mussels, sort out closed ones. Break off empty shell halves. Place mussels on a baking tray. Fill half with parsley mixture, half with tomato sauce. Sprinkle with parmesan and sprinkle with 2 tablespoons of oil
Bake the mussels in a preheated oven (electric cooker: 225 °C/ circulating air: 200 °C / gas: level 4) for 10-15 minutes. Delicious with baguette
Drink: cool white wine