As an expert sommelier and brewer, I can tell you that determining if your sake is “bad” can be a subjective matter. Sake, unlike some other alcoholic beverages, doesn't technically go bad in the sense that it can make you sick. However, the flavor profile of sake can change over time, and it may not taste as the brewer intended.
One way to tell if your sake is not at its best is by examining its appearance. Sake should have a clear and transparent appearance. If you notice any cloudiness or sediment in the bottle, it could be an indication that the sake is past its prime. This cloudiness can occur when the sake has not been stored properly or has been exposed to heat or light.
Another important factor to consider is the aroma of the sake. The aroma should be pleasant and clean, without any off-putting or funky smells. If you detect any unpleasant odors, such as a vinegar-like or rotten fruit scent, it could be a sign that the sake has started to spoil.
When it comes to taste, sake should have a balanced and harmonious flavor profile. It should not have any overly sharp or harsh flavors. If you notice a significant change in the taste of the sake, such as a loss of complexity or an increase in acidity, it may be an indication that the sake has deteriorated over time.
Personal experiences can also play a role in determining if your sake is bad. If you've had the same sake before and it tasted significantly better in the past, it could be a sign that the current bottle is not up to par. Trusting your palate and comparing the taste to your previous experiences can be helpful in assessing the quality of the sake.
It's worth noting that there is a smaller niche movement within the sake industry that actually ages sake intentionally. Just like with wines, some sake producers are experimenting with aging their products to enhance certain flavors and develop unique characteristics. These aged sakes can have a different taste profile compared to fresh sake but can still be enjoyed in their own right.
While sake doesn't technically go bad in the sense of causing illness, it can undergo changes in flavor and aroma over time. Cloudiness, unpleasant odors, and off flavors can be indicators that the sake is no longer at its best. Trusting your senses and comparing your experience with previous bottles can help you determine if your sake is not up to par. However, it's important to note that aged sake is a separate category and can offer unique and enjoyable flavor profiles.