How to dry sweet potatoes to produce white frost? The method is as follows:

1. Choose varieties. The reason why dried sweet potatoes grow white frost is that the sugar contained in the dried sweet potatoes themselves will penetrate into the surface and form white frost. All varieties of sweet potatoes can be made into white frost, but the ones with the sweetest taste are those with red skin and red hearts, which have the most white frost.

2. Place the selected sweet potatoes in a ventilated place indoors to dry for a period of time. Sweet potatoes that have just been dug out of the ground are not suitable for drying, because the starch in these sweet potatoes has not been fully saccharified and it is difficult to form white frost.

3. Wash the prepared sweet potatoes, peel them off, cut them into thick slices and steam them in a pot. When steaming sweet potatoes, you should also pay attention to the scale, so that they are cooked but not rotten.

4. Place the steamed sweet potato slices on a bamboo plaque and place them in a sunny and well-ventilated place to dry. Remember to turn them every two or three hours and keep them dry until The degree of softness or hardness that you like.

5. Dry the sun-dried sweet potatoes until they are completely cool, put them into a porcelain jar or other airtight container, seal them and place them indoors or outdoors. They will grow out in about half a month. There is a layer of white frost, which is the crystallization of sugars such as glucose.

Extended information:

The key condition for drying sweet potatoes and growing white frost is the temperature difference. The reason why we put them indoors or outdoors is to take advantage of the temperature difference between day and night in the natural environment, thereby promoting the growth of sweet potatoes. White frost will grow on the dry surface, but it is impossible to grow white frost under constant temperature conditions.

Baidu Encyclopedia - Dried sweet potatoes