Fish sauce doesn't actually "go bad" in the sense that it becomes unsafe to eat. It's a fermented product, high in salt, and undergoes a rigorous process that eliminates harmful bacteria. However, it can deteriorate in quality over time.
While fish sauce may last for years, it can lose its delicate flavor and become stale. This is due to chemical reactions that happen over time, leading to changes in color or developing "off" flavors.
Here's how to know if your fish sauce is getting stale:
- Color: The color can become darker or less vibrant.
- Taste: The flavor might become less complex or develop a "fishy" or "sour" taste.
To ensure the best flavor:
- Refrigerate: Refrigeration helps slow down the process of deterioration and preserve the flavor for a longer time.
- Use Within: While it can last for years, it's recommended to use fish sauce within 2-3 years after opening for the best flavor.
Overall, you can safely consume fish sauce even if it's past its expiration date, but the flavor might not be as pleasant.
