Rinse the pollack fillets with cold water and pat dry with kitchen paper. Then season well with lemon juice, salt and pepper. Butter an ovenproof, flat dish. Wash the tomatoes and cut each tomato into 4 slices. Place the edge pieces of it on the bottom of the baking dish. Cut the Gouda into 12 to 15 slices of about the same size.
Layer the tomato and cheese slices as well as the fish fillets alternately in the form of a fan.
Cook in a preheated oven at 220 ° C top / bottom heat (convection: 200 ° C) for about 30 minutes.
Sprinkle the tomato slices with chives before serving.