Balsamic vinegar started appearing in American markets in the late 1970s, but Italians have used the dark, syrupy vinegar for centuries to flavor salads, marinades and sauces. The vinegar can also be used as a digestive, dessert sauce, and as a finishing sauce for broiled fish or roasted meats and vegetables. Some balsamic vinegars are cared for and aged as carefully as fine wines, so you want to store them properly so their complex flavors remain intact.
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Cool and Dark
Balsamic vinegar deteriorates in the heat and when exposed to bright light. Choose a pantry or cupboard or another cool, dark space if you primarily use the vinegar to create sauces and reductions and want it at room temperature. If you use balsamic mostly to make salad dressing, you can store it in the refrigerator.
Airtight and Opaque
Keep balsamic vinegar in a dark, opaque bottle or decanter that's fitted with a cap or cork. Clear containers allow light in, which can degrade the vinegar. Air is also an enemy of quality balsamics and can ruin delicate flavor profiles, so always keep the vinegar's bottle tightly capped when it's not in use.
Properly stored balsamic vinegar can last three to five years, and sometimes longer. If you have a high-quality vinegar with a specific taste profile, you may notice its flavor changing as it ages. Lower quality vinegars may grow sharper and more acidic. Old vinegar isn't dangerous to consume, but it may become unpalatable.
Some of the highest quality balsamic vinegars available are up to 150 years old. Don't expect your supermarket balsamic to become a prized, traditional vinegar the longer it sits, though. You have to start with a quality product for it to age into perfection. These long-aged products can cost between $75 and $400 per bottle.