Marinated eel with vinegar and bay leaves is a traditional Christmas Eve delicacy. This high protein mediterranean dish is rich in omega-3s, a fresh family tradition from Comacchio's lagoons.
Pat the eel steaks dry and dust them lightly in all-purpose flour, shaking off excess flour to avoid clumping.
Heat olive oil in a wide skillet over medium heat. Fry the eel steaks in batches until golden on both sides, about 4-5 minutes per side. Remove and set aside on paper towels.
In the same pan, lower the heat and add the sliced onions, stirring until softened but not browned, about 5 minutes.
Add white wine vinegar, bay leaves, black peppercorns, and salt to the onions. Bring to a gentle simmer, and cook for 5 minutes to meld flavors.
Layer the fried eel, cooked onions, and bay leaves in a deep dish. Pour the hot vinegar and onion mixture over the eel, making sure all pieces are submerged. Let marinate for at least 2 hours at room temperature, or overnight in the refrigerator before serving.