The following websites may be useful in your search for information.
Watch this video!! Access the video by clicking on the link.
iTunes offers this free app. Search Markon Vegetable to access.
Click on a region of the world to get started. Then type your vegetable's name in the search bar. This will direct you to countries that include the vegetable in their diet.
There is a cart of books containing information on vegetables, vegetariansim, nutrition, and recipes. Use the table of contents and the index to help you find the information you need.