Wash the purple potato, do not peel it, and steam it with the skin (because the anthocyanin content in the purple potato skin is also high, like the nutrition of eggplant skin is in the skin. I came up with it myself. I don't know, right? ), cut into pieces and cook faster. I steamed in a rice cooker for half an hour (the microwave oven is hot 10 minutes is enough). I thought it would evaporate. Because of the steam in the pot, the purple potato may be thin, but I didn't expect it to be very dry

Let the steamed purple potato cool, and then you can adjust the yeast water. Take 2 tablespoons of yeast, 1 tablespoon of sugar (according to the proportion that a small bag of Angel yeast can make 2-3 kilograms of flour), pour in warm water (not exceeding 30 degrees, it is advisable not to burn your hands), melt and stir evenly.

Take a large pot and finely twist the purple potato into a paste (if there are children's shoes, it is best to sieve them, which will have a more delicate taste and appearance. But I think it's necessary to keep those fiber components as much as possible, so I didn't pass), then pour in flour, slowly pour in yeast water, and stir evenly with chopsticks while pouring.

Basically, the dough can be kneaded until it is smooth and non-sticky, then it is kneaded into a pot, covered with a lid or plastic wrap, left for 20 minutes to half an hour, and kneaded into a small shape by hand.

Spread wet gauze or oil on the steaming grid, and put the steamed bun on the steaming grid, paying attention to leaving gaps. Because there is secondary fermentation in the pot, it will continue to get bigger and stick together without gaps, so I put this too tightly. At this time, add a little temperature to the water, a little is enough, turn off the fire and cover it for secondary fermentation.

Reheat after 5 minutes and steam over medium heat 15 minutes.

Purple sweet potato is rich in selenium and anthocyanin besides the nutrients of ordinary sweet potato.

1. The anthocyanin content is 20- 180mg/ 100g. Anthocyanin is the best free radical scavenger, which can effectively resist oxidation and aging.

As we all know, selenium is known as the "king of cancer", which can enhance human immunity, scavenge free radicals in the body, and inhibit the synthesis of DNA and the division and growth of cancer cells.

2. Purple sweet potato is also rich in beta carotene, mucin and other vitamins and minerals. It has the functions of reducing blood fat and cholesterol, and is a pure natural health food for protecting liver, nourishing eyes, preventing cancer and repairing.

Third, purple potato is rich in dietary fiber, which can promote gastrointestinal peristalsis and help digestion.