Lots of tips and tricks, such as how to crisp celery and cooking a bit of red pepper in with vegetables to "modify unpleasant odors." Simply stated directions and interesting recipes such as "Ambushed Asparagus" and "Celery Au Gratin" - all seemingly easy to make. Nasturtiums, salsify, and other unusual ingredients.
Get more detail about Vaughan's Vegetable Cook Book (4th edition) How to Cook and Use Rarer Vegetables and Herbs.