To deepen the color of the purple sweet potato porridge, peel and cut the purple sweet potatoes into small pieces and soak them with rice in clean water for two hours; make sure to wash the rice beforehand.Or you can grind the purple sweet potatoes into a paste and add it while cooking.Question: Will this porridge not turn blue when cooked?Answer: Do not use iron or aluminum pots, using a clay pot is best.Or blend the purple yam into a paste and add it while cooking.

Follow-up: Will the porridge not turn blue when cooked this way?

Response: Do not use an iron pot, and better yet, avoid aluminum pots,a clay pot is best..