Cleaning and washing vegetables. Cut zucchini into slices, tomatoes into slices. Peel onion, slice into thin rings. Thyme wash, pluck. Wash lemon hot. Cut off 4 slices, squeeze the rest.
Mix the vegetables and distribute each in the middle of the parchment sheets. Sprinkle with some thyme. Season with salt and pepper.
Wash the fish, dab dry and cut into 4 pieces. Season with salt and place on the vegetables. Drizzle oil over them. Cover with lemon slices. Sprinkle the rest of the thyme on top.
Fold the paper over the fish, tie up the ends with kitchen string. Put the parcel on a baking tray. Cook in a hot oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer) for 20-25 minutes.
Cook the rice in a good 300 ml of boiling salted water according to the package instructions. Arrange everything.