
Heat a frying pan with sunflower oil. Fry the onion with the bay leaf until the onion is golden. While the onion is frying, take a plastic bag and pour flour into it. Put the liver pieces into this bag and shake well so that each piece is covered with flour.

Place the prepared liver pieces in a frying pan with fried onions. Fry the liver for 5 minutes over high heat, stirring occasionally. Remove the bay leaf from the frying pan and discard it. Pour the cream heated in the microwave into the frying pan, add sour cream, salt and pepper. Stir the liver until the sour cream and cream dissolve into a smooth sauce. Bring the sauce to a boil, reduce the heat. Cook the liver, stirring, for another 5 minutes.