Yes, fermented bean paste does expire, although its shelf life is significantly longer than many other foods due to the fermentation process. However, "expiration" in this context refers to both spoilage and a decline in quality.
Shelf Life and Storage
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Refrigeration is Key: Proper storage is crucial. Keeping the paste in an airtight container in the refrigerator significantly extends its lifespan. Minimizing air exposure is essential. [Source: Unidentified reference mentioning weeks in the fridge]
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Quality vs. Spoilage: While fermented bean paste can technically last for years, its flavor and quality will gradually decline over time. [Sources: Reddit threads on doenjang and miso, Quora discussions on miso shelf life] Think of it like wine – it might not "go bad" in the sense of being unsafe, but the taste might change significantly.
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Timeline: While some sources suggest several years under refrigeration, the best quality is usually retained for 3 months after opening. After that, the flavor profile might change. [Source: Unidentified reference mentioning 3 months after opening] Other sources mention a year or even longer under ideal conditions but emphasize the changing flavor profile. [Sources: Reddit and Quora discussions on miso and fermented bean curd]
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Signs of Spoilage: Look for mold, unusual odors, or significant changes in texture or color. If you notice anything amiss, it's best to discard the paste. [Source: Reddit discussion on fermented bean curd indicating color change].
Types of Fermented Bean Paste
The specific shelf life can vary slightly depending on the type of fermented bean paste (e.g., miso, doenjang, etc.). However, the general principles of airtight refrigeration apply to all.
Conclusion
Fermented bean paste has a long shelf life when refrigerated properly, but its quality diminishes over time. Discard if you notice any signs of spoilage.
