Drain the mushrooms. Dust liver with flour, fry in oil for three to four minutes on each side, season with salt and season with pepper. Take out, keep warm, mix whipping cream with mushroom can liquid and starch, stir into stewing stock, bring to boil, add mushrooms. Cook mashed potatoes according to instructions, sprinkle with fried onions.
Per person about 551 calories or 2308 joules.