Slightly flour the liver slices.
Heat a heavy iron skillet, generously covered with olive oil and fry the liver slices for about 2 minutes on each side.
Place the liver in a serving dish.
To the same skillet add the onion and garlic and fry until the onion becomes transparent.
Pour the wine, mix with a wooden spoon and scrape the bottom in order to extract hidden flavors.
Add salt and pepper to taste and cook until the sauce thickens and reaches the desired consistency.
Pour on the liver slices.
Recommended to serve with berry sauce.