Preheat the oven to the 200 degrees C, air circulation and elements (not grill), rack in the middle.

In a large rectangular non-stick oven dish add the fish, insert in their bellies the herbs and some lemon slices, drizzle with the oil, put the tomato slices on top and season with the salt & pepper.

Cover well with parchment paper and tightly close with aluminum foil.

Cook for 40-50 minutes, uncover and cook for further 15 minutes to achieve some coloring.