Wash the fish, cut the fins, heads and tails. Open the abdomen and remove the entrails. Do not forget about the black film in the abdomen. If it is not removed, then the finished dish will get a bitter aftertaste.
On one side of the mackerel carcass, make shallow cuts with a sharp knife. Sprinkle a lot of fish with salt and seasonings. Pour the fish with freshly squeezed lemon juice ½ lemon. Leave to marinate for 20 minutes.
While the fish is pickling, proceed to peel the potatoes. Wash the peeled potatoes and cut into slices, as in the image.
Onion cut into half rings.
Lubricate the walls and bottom of the nasty or baking dish with a little vegetable oil.
Spread chopped potatoes and white onions in a mold. With your hands, mix the onions and potatoes right in the form, salt, pepper and add your favorite spices.
Place a few half rings of onions in the cuts on the carcass of a mackerel.
Put the fish on the potatoes with onions and with your hands squeeze a little so that the fish is in the potatoes.
Send the form with fish and potatoes to the oven preheated to 200 degrees. Bake until tender, until golden brown.
The flow time in the oven is on average 50-60 minutes.
Baked mackerel in the oven with potatoes ready!