How Long Does Parmesan Cheese Keep

How Long Does Parmesan Cheese Keep? A Guide to Storage and Shelf Life

Parmesan cheese, with its sharp, nutty flavor and granular texture, is a culinary staple. But how long does this prized ingredient actually last? Understanding parmesan cheese shelf life is crucial to avoid waste and ensure you're always enjoying the best possible flavor. This guide will cover everything you need to know about storing and extending the life of your parmesan. Knowing how long parmesan cheese keeps will help you make the most of your purchase.

Understanding Parmesan Cheese Types

Before we delve into shelf life, it's important to distinguish between types of parmesan. "Parmigiano-Reggiano" (often shortened to Parmigiano or Parm) is a specific, protected designation of origin (PDO) cheese made in a limited area of Italy. Other "parmesan" cheeses may have slightly different production methods and aging times, affecting their shelf life. While the information below generally applies, slight variations may exist.

How Long Does Parmesan Cheese Last?

The shelf life of parmesan cheese depends largely on how it's stored.

• Unopened, in its original packaging: An unopened wheel or block of parmesan, properly refrigerated, can last for several months, sometimes even up to a year, past the "best by" date printed on the packaging. The hard rind acts as a natural barrier, protecting the cheese from spoilage.

• Opened, refrigerated: Once opened, the shelf life is significantly reduced. A block of parmesan, properly wrapped and refrigerated, should ideally be consumed within 2-3 months. However, it can often still be safely eaten for longer, provided it doesn't show any signs of spoilage.

• Grated parmesan: Grated parmesan has a much shorter shelf life. Its increased surface area makes it more prone to drying out and developing unwanted flavors. Store grated parmesan in an airtight container in the refrigerator and consume it within 1-2 weeks for optimal quality.

Recognizing Spoiled Parmesan

It's crucial to be able to identify spoiled parmesan cheese to prevent foodborne illness. Look for these signs:

• Mold: Visible mold is a clear indication that the cheese has spoiled. Discard any parmesan showing mold growth. Even if you can cut around the moldy area, it's safer to discard the whole block to avoid potential contamination.

• Unpleasant Odor: Spoiled parmesan will have a pungent, unpleasant odor. If the cheese smells sour, rancid, or otherwise off-putting, discard it.

• Slimy Texture: A slimy or sticky texture is another sign of spoilage. Fresh parmesan should be firm and slightly crumbly.

• Changes in Color: While parmesan naturally darkens with age, significant discoloration or the presence of unusual spots can be a warning sign.

• Hardening: While some parmesan will naturally dry and harden with time, excessive hardening beyond the usual aging is a sign that the cheese is drying out and becoming inedible.

Extending the Shelf Life of Parmesan Cheese

To maximize the shelf life of your parmesan cheese, follow these storage tips:

• Proper Wrapping: Wrap opened parmesan tightly in plastic wrap or place it in an airtight container. This prevents it from drying out and absorbing odors from other foods in the refrigerator.

• Refrigeration: Always store parmesan cheese in the refrigerator. Avoid storing it in extremely cold areas that could accelerate the drying out.

• Freezing: Parmesan can be frozen, although it may become slightly crumbly after thawing. Wrap it tightly in plastic wrap and then in aluminum foil or a freezer bag to protect it from freezer burn. Frozen parmesan can last for 6-12 months.

• Vacuum Sealing: Using a vacuum sealer to store parmesan can significantly extend its shelf life. This helps to remove air and moisture, preventing spoilage.

By following these guidelines on how long parmesan cheese keeps and how to properly store it, you can enjoy this delicious cheese for longer and avoid unnecessary waste. Remember, always err on the side of caution; when in doubt, throw it out.