Storing and Reheating
If not eating immediately, wrap each musubi very tightly in plastic wrap and refrigerate. Wrapping the musubi will help keep it all together and also help the rice to not dry out so quickly. I wrap it while it is still very hot so all that steam stays inside. Refrigerate Spam musubi within 2 hours of making it (1 hour if the temperature is above 90°F). If you're packing it for lunch, keep it cold in an insulated lunchbox with ice packs. To refrigerate, place the wrapped musubi pieces in an airtight container in the fridge for up to 4 days. To re-heat, remove the plastic wrap, then wrap the in a damp paper towel and microwave for 45 seconds or until heated through.