As an expert sommelier and brewer, I can assure you that using expired bitters is unlikely to cause any harm. Bitters, like other spirits, have a virtually indefinite shelf life. While the taste may change over time due to chemical reactions and evaporation, the product won't spoil or become unsafe to consume.
When it comes to bitters, the main purpose is to add flavor and complexity to cocktails and other beverages. The primary ingredients in bitters are herbs, spices, and botanicals, which are typically macerated or infused into a base spirit. These ingredients are known for their longevity and ability to preserve well.
Over time, however, the flavors of the bitters may mellow or evolve. This can be influenced by factors such as exposure to light, temperature fluctuations, and the quality of the bottle's seal. The taste may become less vibrant or intense, but it doesn't mean that the bitters have gone bad.
I have personally come across bottles of bitters that have been stored for several years without any noticeable decline in quality. In fact, some enthusiasts even prefer aged bitters for their unique flavor profiles. It's worth noting that the taste evolution can vary depending on the specific brand and recipe of the bitters.
If you find yourself with a bottle of expired bitters, it's perfectly fine to use them in cocktails or recipes. However, it's important to keep in mind that the flavors may be more subdued than when the bitters were fresh. You might need to use slightly more of the expired bitters to achieve the desired flavor impact.
To ensure the longevity of your bitters, it's recommended to store them in a cool, dark place away from direct sunlight. This will help minimize the exposure to factors that can accelerate flavor degradation.
Using expired bitters is not a cause for concern. While the taste may change over time, the product is unlikely to spoil or become unsafe. Feel free to experiment with aged bitters and adjust the quantities to suit your preferences. Enjoy the unique flavors that time can impart on these delightful spirits.