Purple sweet potato and kelp can be stewed together. Here’s how to make purple sweet potato and kelp soup. \x0d\Main ingredients: 300g purple sweet potato, 100g kelp\x0d\Accessory ingredients: appropriate amount of rock sugar \x0d\Steps of making purple sweet potato and kelp soup:\x0d\1. Soak the kelp in advance, cut into small pieces and set aside. \x0d\2. Peel the purple sweet potato and cut into small pieces and set aside. \x0d\3. Prepare appropriate amount of rock sugar. \x0d\4. Put enough water in the pot, add kelp and bring to a boil over high heat and simmer for 5 minutes. \x0d\5. Add the diced purple sweet potato and rock sugar and cook for half an hour before turning off the heat and serving. \x0d\6. Pour rock sugar into the pot as well. \x0d\7. The hot purple sweet potato and kelp soup is out of the pot.