Purple sweet potato and millet can be cooked together. The reason why purple sweet potato turns green is because purple sweet potato contains anthocyanin, which is a water-soluble pigment. When anthocyanin encounters acid and alkali, it will change color. It will appear red when it is acidic, and blue-green when it is alkaline. Since the tap water we usually drink at home is generally alkaline, the water used to cook purple sweet potatoes is mostly blue-green in color.

Main ingredients: 50g millet, 1 purple sweet potato

Accessory ingredients: appropriate amount of water, appropriate amount of baking soda

1. Prepare purple sweet potato and millet.

2. Wash the millet with water, wash the purple sweet potato, and cut into small pieces.

3. Add appropriate amount of water and a little baking soda.

4. Cover the pot and turn the pot over high heat.

5. Turn to low heat and cook for about 15 minutes.

6. A bowl of purple sweet potato and millet porridge is ready.

Reference for the above content? People's Daily Online - Purple sweet potato and millet can be cooked together to eat porridge. The reason why purple sweet potato turns green is that it contains anthocyanins