Why does my sake taste like vinegar?

Question

Opened a bottle of junmai about three weeks ago, kept it in the cupboard with the cap back on, and had a glass tonight. It is sharp and sour in a way it…

namazake_fridge · Accepted Answer

You ruined it, gently, and the cupboard did most of the work. Once a bottle is open the sake is in contact with oxygen and starts changing: over days to weeks it loses aroma and goes flat, then sour and stale. Three weeks is well past it.

Heat and light accelerate all of that, so a cupboard is worse than a fridge and a sunny shelf is worse again. Opened sake goes in the fridge, resealed, and most sources suggest drinking it inside a week or two for the flavour you paid for.

warm_cupboard · Answer

Worth adding that most everyday sake is not meant to be kept. Aged styles exist, but a standard bottle does not improve on a shelf for a year, and people treat it like wine and are then disappointed.

What good sake should taste like, for comparison: fruity and floral, or rich and ricey, or dry and crisp, or savoury. Some styles are noticeably acidic, but balanced and fresh rather than sharp and souring.

Why does my sake taste like vinegar?

3 answers