Natto is fermented soybeans with a stringy, viscous texture. If needed, gently rinse it in cold water to slightly reduce its strong fermented flavour.
In a separate saucepan, combine the white wine vinegar, water, brown sugar, and salt. Heat over medium heat until the sugar is completely dissolved.
Add the thinly sliced garlic, ginger, chili flakes, black peppercorns, cumin seeds, mustard seeds, and lemon juice. Simmer over low heat for 3 minutes to allow the flavours to meld.
Place the natto in sterilized jars, then pour the hot spicy pickling brine over it.
Seal the jars and let them cool to room temperature. Then, refrigerate for at least 12 hours to allow the flavours to fully develop.
Serve cold as a unique Japanese pickle or alongside salads.
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