To store leftover ice cream, transfer it to an airtight container and place it in the freezer. Make sure the container is tightly sealed to prevent air entering and causing freezer burn. It's best to use a container that is just the right size for the amount of ice cream you have, as extra space in the container can also contribute to freezer burn. If you're using a container with a lid, press a sheet of plastic wrap directly onto the surface of the ice cream before closing the lid. This will help prevent ice crystals from forming on the surface of the ice cream. When you're ready to serve the leftover ice cream, remove it from the freezer and let it sit at room temperature for a few minutes to soften before scooping. Alternatively, you can microwave the ice cream for a few seconds to soften it, but be careful not to overheat it, as this can cause the ice cream to melt.