Peel the pumpkin and remove the seeds. Cut into small cubes. Add salt, garlic passed through the press and oil.
Cut the fish fillet into portions. Add salt, ground pepper, oregano and lemon juice. Mix thoroughly and leave for half an hour to marinate. In a baking dish, put the pumpkin on top of the onion cut into half rings.
Next, pieces of fish. Cover the form with foil and send it to the oven for 35-40 minutes. Then remove the foil and put the fish in the oven for another 10 minutes.