Wash, clean and drain the zucchini and tomatoes. Cut the zucchini into slices and the tomatoes into slices. Peel onion and slice into thin rings. Wash the thyme, shake dry and pluck roughly into pieces. Wash the lemon, grate dry and cut off 4 thin slices. Squeeze the rest of the lemon
Wash the fish fillet, dab dry and cut into 4 pieces. Place sheets of paper on a work surface. Mix the vegetables and distribute them in the middle of the sheets. Sprinkle with some thyme, season with salt and pepper. Sprinkle salt on the underside of the fish fillets, place them on the vegetables and also salt the top side slightly. Sprinkle with lemon juice and oil. Cover with lemon slices and sprinkle with remaining thyme
Fold the parchment paper over the fish and seal the sides with kitchen string. Lift the parcels onto a baking tray and bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for 20-25 minutes. In the meantime, prepare rice in boiling salted water according to the instructions on the packet and add to the rice