I call these New Orleans onions because I was inspired by an old Creole recipe for Spanish onions. In that version, the onions are braised in beef stock enhanced by the addition of liquor such as bourbon or port. After the onions are cooked, the cooking juices are reduced and herbs, such as capers or fresh thyme, may be added to the concentrated sauce. In my opinion, this simplified version is every bit as tasty. If your guests like spice, pass hot pepper sauce at the table.