To make this Fried Cabbage with Bacon and Onions gluten free, verify that the bacon, chicken broth, spices, and liquid smoke are labeled gluten free, since some brands may include additives or flavorings that contain gluten. The vegetables and apple cider vinegar are naturally gluten free, but packaged ingredients should always be checked carefully if cross-contact is a concern. If serving this dish as part of a gluten-free meal, make sure any accompanying sides are also gluten free.