Yes, adding vinegar to chutney before storing is generally recommended. It acts as a preservative, inhibiting bacterial growth and extending the chutney's shelf life.
Vinegar's acidity is the key to its preservative properties. Most harmful bacteria struggle to survive in acidic environments. By adding vinegar to your chutney, you lower its pH level, creating an inhospitable environment for these microorganisms. This helps prevent spoilage and keeps your chutney safe to eat for a longer period. The amount of vinegar needed depends on the recipe and the desired level of tartness. Generally, a ratio of about 1 part vinegar to 4 parts fruit or vegetables is a good starting point. Ensure the vinegar is thoroughly mixed into the chutney before jarring and sealing. The type of vinegar used can also influence the flavor; white vinegar provides a clean, sharp taste, while apple cider vinegar offers a slightly sweeter and more complex flavor. Experiment to find what you prefer.
Always use sterilized jars and lids when storing chutney to further minimize the risk of contamination and ensure a longer shelf life. Boiling the jars and lids for 10 minutes before filling is a simple and effective method.