It is best to use an iron pan, which can also increase the iron deficiency of the human body.

Generally speaking, milk should be boiled for 2~3 minutes after boiling. Generally, a cup of milk of about 250 ml can be boiled at a high temperature of 70℃ in a gas stove for about 3 minutes.

The quickest way to cook milk is to fill the pot with water, put the milk in a bowl and heat the milk through heat transfer. The milk in the paste pot can't be drunk, because the protein in the milk has changed, which may produce carcinogenic components.

Extended data:

Avoid drinking cold milk in summer. In hot summer, many people covet convenience and coolness, and like to drink cold milk, which is actually harmful. Milk is nutritious and contains protein, mainly casein, followed by whey protein and lactoglobulin.

Because of the high temperature in summer, milk is a good culture medium for bacteria. Boiled milk will be contaminated and propagated by bacteria after several hours of cooling, and it is easy to cause intestinal diseases after drinking. So drinking hot milk in summer is better than drinking cold milk. Because hot milk can not only kill bacteria, but also denature protein in milk, which is more conducive to human digestion and absorption.

References:

Baidu Baike milk