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The delicate flavor of a sweet potato is lost if it is not cooked properly. Steaming develops and preserves the flavor better than boiling, and baking better than steaming.
A sweet potato cooked quickly is not well cooked. Time is an essential element. Twenty minutes may serve to bake a sweet potato so that a hungry man can eat it, but if flavor is an object, it should be kept in the oven an hour. The negroes of the South have a way of baking sweet potatoes in ashes covered with coals. They are often put in the ashes after one meal and left there while the negroes are working in the field, to be ready for the next meal. Hence, their fine flavor.