What do you do when a recipe calls for basil and you don't have any? Or if a recipe is for snapper, can you use a different fish? The Cook's Thesaurus is fantastic encyclopaedia that covers these kinds of questions and more.
With pictures, pronunciations, synonyms and suggested substitutions, this online reference can help you get out of cooking jams when you run out of ingredients or just want to substitute alternative or healthier options. Browse by category or just search for the ingredient or kitchen tool in question.
It's also just a useful site for learning more about cooking and tricks about different ingredients. The "ingredient of the month" feature, for example, will teach you, for example, to look for the darkest, shiniest braised red cabbages. Reading about whole grains (a.k.a. berries or groats), you'll learn to toast them before cooking to boost their flavour and speed up the cooking a bit. Enjoy!