Dry gravy mixes, especially those based on dehydrated ingredients like mushrooms, onions, and spices, store well without refrigeration for 12 hours, provided they are kept in a cool, dry, and sealed container. Avoid mixes containing dairy or meat products, as these require refrigeration.
The key to storing dry gravy mixes without refrigeration lies in their composition. Dry ingredients, by their nature, have a lower water activity, which inhibits the growth of bacteria and mold. This is why dehydrated foods are often used for long-term storage.
When selecting a dry gravy mix for storage without refrigeration, carefully examine the ingredient list. Look for mixes that primarily contain:
Dehydrated vegetables: Onions, mushrooms, garlic, etc.
Spices: Pepper, paprika, thyme, rosemary, etc.
Herbs: Dried parsley, oregano, etc.
Starches: Cornstarch, tapioca starch, potato starch (for thickening)
Avoid mixes that contain powdered milk, cheese powder, meat extracts, or other ingredients that are prone to spoilage at room temperature. These ingredients significantly increase the risk of bacterial growth and foodborne illness.
Proper storage is also crucial. The dry gravy mix should be stored in an airtight container to prevent moisture absorption. Moisture can lead to clumping and create a favorable environment for microbial growth. A sealed plastic bag or a container with a tight-fitting lid is ideal. Keep the container in a cool, dry place away from direct sunlight and heat sources.
Before storing, consider adding a desiccant packet (like those found in vitamin bottles) to the container to absorb any residual moisture and further extend the shelf life of the dry gravy mix.