The Classic Dish: Beef Liver and Onions

Ingredients :

1 pound beef liverADVERTISEMENT2 large onions, sliced1/2 cup all-purpose flourSalt and pepper to taste4 tablespoons butter2 tablespoons olive oilADVERTISEMENT1/2 cup beef broth2 tablespoons balsamic vinegar (optional)Fresh parsley, chopped (for garnish)

Préparations :
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