Boil potatoes until tender. Set aside and keep warm.
Cook apples in 1 ounce of butter with cloves and nutmeg until soft. Remove cloves and mash with remaining butter. Season with salt and pepper, set aside and keep warm.
Meanwhile, season the liver with salt and pepper, and cook quickly in hot oil for 1 minute per side. Place liver on top of potatoes. Dust onions with flour and crisp in pan and place on top of the liver. Top with apple mixture.