Dice the liver and roll it in the flour. Heat the butter in a large saucepan. Add the liver and fry. Dice the onion and add to the liver. Add the mushrooms to the saucepan as well.
When the onion cubes are translucent, deglaze with half of the broth and bring to the boil. Add the cream and let simmer for about 10 minutes. Pour the rest of the broth into the saucepan. Season with salt and pepper. Let simmer for another 5 minutes.