2. Put a copper pot on the fire, add some water, and then add sugar. The ratio of water to sugar is 2 1. In other words, put two parts of water and one part of sugar.
3. After the sugar is put away, gently stir it with a spoon, which is conducive to the dissolution of sugar and prevents sticking to the bottom or coking.
4. Start the fire heating, so that the water temperature will rise rapidly to dissolve the sugar in the water. This process should not be too slow. At this time, you can see that the sugar particles gradually become smaller until they disappear and completely become a solution of sugar.
5. With the increase of water temperature, the sugar solution began to change. After water boils, water vapor begins to be discharged into the air. At this time, the temperature of the sugar solution gradually becomes higher, and the moisture in the sugar solution gradually decreases. At this time, if you insert the thermometer into the sugar solution, you can see that the temperature of the liquid exceeds 100 degrees Celsius. As time goes on, the temperature will rise, and you can see that the sugar solution begins to bubble. This is because there is less water in the sugar solution, and the tension of the sugar solution is greater. In the process of exhausting gas, some large bubbles will appear on the surface of sugar. This process will last for a period of time, mainly paying attention to the stability of the heat, not to be big and small, but to turn it regularly (every two or three minutes).
6. The temperature is not enough at this time. The suitable temperature for boiling sugar is that the color turns slightly yellow and the big bubbles turn into small bubbles.
origin
Emperor Song Guangzong's name was Zhao Dun, and the year number was "Shao Xi". During the reign of Shao Xi, Huang Guifei, the favorite of Song Guangzong, fell ill. She is sallow and emaciated, and she doesn't think about eating or drinking. The doctor used many expensive drugs, but none of them worked. When the emperor saw that his beloved princess was getting haggard, he was also sad all day. In the end, I had no choice but to post a list of medical treatment. A quack revealed the list and entered the palace. Huang Guifei took her pulse and said, "As long as you use rock sugar and red fruits (that is, hawthorn), you should take five to ten tablets before meals every time, and you will be fine within half a month." At first, everyone was dubious, but fortunately, this way of eating was also to the taste of the imperial concubine. After taking it in this way, the imperial concubine recovered as scheduled. The emperor was naturally overjoyed and began to frown. Later, this practice spread to the people, and the people strung it together and sold it, which became a sugar-coated gourd.
References:
Tanghulu-Baidu Encyclopedia