1, raw materials:

Sweet potato, water.

Exercise:

1, and the sweet potato is washed with clear water;

2. When the water is boiled or steamed in a steamer, put the sweet potato down immediately to make its skin half-cooked in a short time;

3. Then use a big fire to keep the water in the pot from boiling. Because the amylase in sweet potato can promote the rapid conversion of starch into sugar at about 60 degrees Celsius. Burn it for more than 10 minutes, cook it with strong fire, and immediately pour out the water, because the sweet potato will become weak after soaking for a long time and absorbing too much water.

The starch of sweet potato in water has deteriorated and oxidized when it meets oxygen in the air.

Problems to be paid attention to when eating sweet potatoes:

Eat sweet potatoes in moderation. Sweet potato contains a substance called "gasification enzyme", which can produce carbon dioxide gas in the intestine, causing abdominal distension and hiccups; Secondly, sweet potatoes contain more sugar. Eating too much will stimulate the increase of gastric acid secretion and have the feeling of heartburn. At the same time, the stomach is stimulated by a large amount of acid to contract and strengthen, and the pressure increases, which can make the acid flow back to the esophagus and produce acid vomiting. The way to prevent these side effects is: don't eat too much sweet potato, eat it with staple food or vegetables to reduce gastrointestinal discomfort. (In addition, friends with bad stomachs should eat sweet potatoes in moderation).