Candied eggs, also known as semi-cooked eggs, mean that the egg white is already solid, but about half of the yolk center is semi-solid, and there is no fully cooked boiled egg or fried egg. This does not mean that egg yolks are all liquid. Because it is not completely cooked, preserved eggs have the problem of poor nutrient absorption and the risk of infection with pathogenic bacteria and parasites. Candied eggs are also the name of a dish.

Eggs are one of the best sources of nutrition for human beings. Eggs contain a lot of vitamins and minerals and protein with high biological value. For people, the protein quality of eggs is the best, second only to breast milk. An egg contains half an apple or half a glass of milk, but it also contains 8% phosphorus, 4% zinc, 4% iron, 12.6% protein, 6% vitamin D, 3% vitamin E, 6% vitamin A, 2% vitamin B and 5% vitamin B2.4%. These nutrients are essential to the human body, and they play an extremely important role, such as repairing human tissues, forming new tissues, consuming energy and participating in complex metabolic processes.