Yes, glass jars are excellent for storing gravies and help prevent flavor mixing due to their non-porous nature and airtight seal when properly closed.
Glass jars are ideal for storing gravies for several reasons. First, glass is non-porous, meaning it doesn't absorb flavors or odors from the food stored inside. This prevents the gravy from picking up any unwanted tastes from previous contents or imparting its flavor to the jar itself. Second, when paired with a tight-fitting lid, glass jars create an airtight seal. This seal is crucial for preventing oxidation and the absorption of external odors, both of which can alter the gravy's flavor. Finally, glass is easy to clean thoroughly, ensuring no residual flavors linger from previous uses. To maximize flavor preservation, ensure the gravy is cooled completely before sealing it in the jar and refrigerating it promptly.
When storing gravy in glass jars, leave a small amount of headspace at the top of the jar. This allows for expansion as the gravy cools and freezes, preventing the jar from cracking.