To store leftover sauteed green beans and onions, it is important first to let them cool down to room temperature. Once cooled, transfer them to an airtight container. It is advisable to divide the sauteed green beans and onions into smaller portions, making it easier to reheat only what is needed later.u003cbru003eu003cbru003eLabel the container with the date and place it in the refrigerator. When ready to reheat, simply take out the desired portion and warm it up in a pan over medium heat, stirring occasionally. The sauteed green beans and onions can also be stored in the freezer for longer-term storage. To freeze, use a freezer-safe container and leave some space for expansion.u003cbru003eu003cbru003eWhen reheating frozen sauteed green beans and onions, thaw them in the refrigerator overnight and follow the same reheating instructions as above.