Clean and scale the red mullet, leaving any roe inside. Roll in seasoned flour and fry in a little cooking oil for 5 minutes or so on each side. Transfer to a heated serving dish and keep warm.
Add a little more oil to the pan and tip in the onion and garlic, red pepper and the herbs. Allow to fry gently until the onion begins to colour, then pour in the vinegar and reduce the sauce a l