We chop the onion, garlic, tomato and green pepper into small pieces. We clean our fish and divide it into 4 pieces. We do not peel the skin of the fish.
We put butter, olive oil, onion and garlic into our pot. We sauté these ingredients over low heat for 2-3 minutes. Then we add the pepper. We mix it some more.
Finally, we add our tomatoes and cook for another 2-3 minutes.
We put half of our mixture on the tray. We add coarsely chopped parsley on top.
We arrange the fish we prepared in advance, skin side up. We add the remaining mixture and put our sliced lemons on it.
We put our tray in the oven preheated to 180 degrees. If you wish, you can grate cheddar cheese on top after it is cooked. Enjoy your meal. Note: It is very important not to let it sit, otherwise the fish may spoil. If you don't like sour, you can also make it without lemon.