Sprinkle halibut slices with juice of one lemon and stand for about 15 min. Peel and finely dice the onion, dice the tomatoes.
Grease an oblong ovenproof dish with a lid with butter, fill in the onion and tomato cubes, sprinkle the fish with salt and pepper and place on top.
Cream butter, add dill, tarragon and basil and season with salt, pepper and Worcestershire sauce. Spread the herb butter evenly over the fish in flakes, cover the dish with the lid and bake at 175 °C for about 35 minutes.
Our tip: If you like to cook with fresh herbs, it’s best to get kitchen herbs in pots – that way you’ll always have everything on hand!