Although it has been online for years, I only recently discovered this incredibly handy resource. Use this simple website to find substitutes for cooking ingredients. Say a recipe calls for buckwheat flour, which you most likely don't have on hand. What do you use? Type in the term and presto: The links take you to an entry which will suggest alternatives. I also find the site helpful in quickly introducing myself to new ingredients. While not exhaustive, it lists about 90% of the ingredients you'll probably encounter, including many exotics, usually with a helpful photo and a short summary of its origin. This thesaurus of ingredients is fast, simple, and just right.