One Of The Best Ways To Preserve Mushrooms Before They Go Bad Is To Pickle Them - Tasting Table
Briefly

Pickling mushrooms not only extends their fridge life but enhances their umami flavor, making them a versatile condiment for various dishes.
Pickled mushrooms can add a burst of flavor to dishes like brown rice salad or be enjoyed on their own as popular zakuski in Russia.
Quick pickling allows for immediate consumption of mushrooms, adding longevity and flavor without requiring special equipment or techniques.
Choosing the right vinegar for pickling is crucial; it should have at least 5% acidity to ensure mushrooms stay safe and flavorful.
Read at Tasting Table
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