Purple sweet potatoes have many benefits. Eating them regularly can help prevent constipation. Drinking purple sweet potato glutinous rice soup can help you get rid of the trouble of constipation!
【Name】
Purple Sweet Potato Glutinous Rice Soup
【Ingredients】
Purple sweet potato, glutinous rice flour, white sugar.
【Instructions】
1. Wash and peel the purple sweet potatoes. Cut them into pieces and set aside.
2. Put 150g of glutinous rice flour in a large bowl. Gradually add some water to form a glutinous rice dough.
3. Then, take the glutinous rice dough and roll it into long strips. Break it into small pieces and set aside.
4. Next, put the cut purple sweet potatoes in a pot and add some water. Bring to a boil and cook for 5 minutes.
5. Then, add the glutinous rice pieces and stir. Cook until done. Add an appropriate amount of white sugar. Mix well and serve.
【Why is the water boiled from purple sweet potatoes green】
This is because purple sweet potatoes contain abundant anthocyanins, which are water-soluble pigments. Anthocyanins change color when they encounter acid or alkali. When they encounter alkali, they turn bluish-green, and when they encounter acid, they turn red. This is a normal phenomenon and can be safely consumed.
The color of purple sweet potatoes is due to the anthocyanins inside. This natural pigment is purple in neutral environments, purplish-red in acidic environments, and blue in alkaline environments.
Generally, purple sweet potato porridge and similar dishes can easily turn blue or even green due to water or other factors.
Just add a little white vinegar or lemon juice, which are acidic liquids, and the color will turn back to purple.
