Fried and Marinated Monkfish Medallions - Lidia

Ingredients

• 1 ½ pounds monkfish (or other) fillets
• Salt and freshly ground pepper to taste
• Flour for dredging
• 1 ½ cups vegetable oil
• 1 large onion, thinly sliced
• ¼ cup olive oil
• 1 sprig fresh rosemary or 1 teaspoon dried
• 4 bay leaves
• 1 teaspoon white wine vinegar
• ½ cup dry white wine
• ½ cup chicken stock (see here)