Preheat the Thermos Fill the thermos with boiling water and let it sit for 5-10 minutes before adding hot food. This ensures the container is already warm and will retain heat longer.

If you want it warm, just heat the chop suey and pack it in a thermos (with the bun packed separately). At lunch, just spoon the chop suey onto the bun and enjoy. Rather not bulk up on bread?