Preheat the oven to 180C.
Prepare the ingredients, get the butter so that it softens) I pre-cleaned the bream from everything superfluous) prepared potatoes and onions)
Cover the mold with foil, grease it with plenty of sunflower oil, cut the onion into rings, and put it in the mold, add a little salt and pepper.
Cut the potatoes into circles, put them on top of the onion, season with salt and pepper)
We set aside)
We take the fish and make incisions along the entire length
Add salt and pepper to the fish outside and inside) And! rub with butter, between the slots, along the entire length, and put a piece of butter inside)
We spread the fish on the potatoes, put lemon slices on top and put it in the oven for 50 minutes)