What do you mean by steaming sweet potatoes backwards?

Processing method of sweet potato: three steaming and three drying.

Ancient reverse steaming, sweet potato aging for the first time. Pre-cooking at high temperature makes sweet potatoes soft and sweet. In the second round, the preliminarily treated sweet potatoes are processed again, and then put into a pot for secondary high-temperature deep baking or long-time continuous fire baking to further improve the taste and aroma. After two rounds of specific operations, the products should be cooled and inspected, and the most important and key quality assurance measures-"three baking" should be implemented. Natural light and air are used to gradually air-dry the product to a suitable moisture content to form the required taste and storage conditions. Repeated and orderly operation process, the output result is softer, sweeter and smoother.