Asking in the regional chat, asking friends and kin members to check what recipe they found has worked well for me.
The number of buyers for recipes is so low that I stopped taking recipies to the Auction Hall years ago. Most people including me either vendor or destroy them. It has to be a recipe that I think might sell. One shot recipe especially a Journal. Or a new recipe that was added in a recent update most people do not have yet.
Unless stated otherwise, all content in this post is My Personal Opinion.