Sandwich is a cold-processed food, and its main materials are: toast, ham, cheese, vegetables, eggs and so on. Generally, if it is sealed and stored in the refrigerator, it can be eaten after heating overnight, and it will not cause harm to health. However, in the case of high temperature in summer, according to the colony reproduction time, overnight sandwiches will breed a large number of bacteria and other microorganisms, which is not conducive to health and may cause physical discomfort. It is not recommended to eat.

Tips for making fresh sandwiches

After the sandwich is baked, it takes a little time to make it. Because there is still residual steam in the freshly baked bread. So in this state, it will be distorted or uneven in thickness. In addition, when you make a sandwich with vegetables, if you don't drain the water, you will make a wet and sticky sandwich.

If heated stuffing is used, it should be completely cooled before use to avoid making the bread wet and sticky. Moreover, between bread and sandwiches, butter, margarine or mayonnaise sauce should be coated first, which can effectively avoid this situation. If you want to use fried or ordinary dishes as fillings, you must wait until the cooling is completed before putting them into the bread.