If you can’t find authentic Chinese ingredients in your local grocery store and you don’t have any Asian markets nearby, you can order them online. But if you’re in a hurry you can also substitute more easy-to-come-by ingredients.
Shaoxing rice wine is an amber cooking wine used in many Chinese dishes. It has a mild, nutty flavor. If you can’t find it locally, you can substitute cooking sherry. Both contain salt, so you won’t need to add quite as much to the finished product.
Chiankiang black vinegar (sometimes also spelled Zhenjiang) is an aged dark vinegar made by fermenting glutinous rice and wheat bran. It has a sweet, tangy, umami flavor, and is indispensable in traditional sweet and sour pork. It’s available in Asian markets or online. If you can’t find it, you can create a mixture of half balsamic vinegar and half white wine vinegar. Add an extra splash of soy sauce for the umami flavor. The taste will be similar, but not quite the same.