Roasted sesame seeds should be stored in an airtight container in a cool, dark, and dry place to prevent them from going rancid and losing their flavor.
Roasted sesame seeds contain oils that are susceptible to oxidation when exposed to air, light, and heat. This oxidation process leads to rancidity, which results in an unpleasant taste and odor. Storing them in an open container accelerates this process. An airtight container minimizes exposure to air, while a cool, dark place protects them from heat and light, all of which contribute to preserving their freshness and flavor for a longer period. A pantry or cupboard away from the stove is an ideal location.
For extended storage, consider keeping your roasted sesame seeds in the refrigerator or freezer. This will significantly slow down the oxidation process and help them maintain their quality for several months. Just be sure the container is airtight to prevent freezer burn or absorption of other odors.