1. Sandwiches can be eaten the next day if they are tightly placed in the refrigerator. The unfinished sandwich can be wrapped in plastic wrap and put into the freezer, which can be kept for about two days. Refrigerated sandwiches can be eaten after being heated in a microwave oven for about 30 seconds, which can not only kill bacteria on the surface of food, but also make it evenly heated.

Sandwich is a cold-processed food, and its main raw materials are toast, ham, vegetables, eggs and so on. If sealed in the refrigerator, it can be eaten after heating the next day, and there will be no adverse reactions.