The sweet potato and purple potato porridge has a nice name: double potato health porridge. The double potatoes in Double Potato Health Porridge indicate that the porridge is the raw material of sweet potato and purple potato porridge. The health-preserving function of the porridge is highlighted, and it is easy to hear and remember. Sweet potato is also called sweet potato, sweet potato, sweet potato, potato, etc. It is an annual herbaceous plant. Purple potatoes are also called black potatoes, and their flesh is purple to deep purple. In addition to the nutrients of ordinary sweet potatoes, it is also rich in selenium and anthocyanins. Porridge is a semi-liquid food made from rice, noodles and other foods.