2. Boil the water in the pot, or immediately put the sweet potato into the pot or drawer after the steamer comes up to steam, so that the skin of the sweet potato will be boiled to half-cooked in a short time.
3. Use slow fire to keep the water in the pot warm without boiling. After cooking in this way for 10 minutes, and then cooking with high heat, sweet potatoes will be sweeter, softer and more delicious.