Casserole of buckwheat, fish and mushrooms under a cheese crust.
Saute the mushrooms in half the butter. Finely chop the onion, add to the mushrooms.
Grease a baking dish with oil, sprinkle with breadcrumbs. Cut the fish into portions, put in a mold. Add chopped eggs to boiled and slightly cooled buckwheat and mix. Put buckwheat porridge with eggs in a mold
Put onions with mushrooms, sour cream.
Sprinkle with grated cheese and bake in the oven until golden brown. Enjoy your meal!