[header] How to make korean sweet potato cake [title] Fill a medium sized stock, soup or multi-cooking pot with 1.5 lbs of korean sweet potatoes (unpeeled). [title] Cover with already hot water (to speed up the boiling process) so that the korean sweet potatoes are resting about one inch below the surface. [title] Bring korean sweet potatoes to a boil and let cook for 25 minutes. 
[title] While the korean sweet potatoes are cooking, cut the sponge cake lengthwise in three parts. [step] Two of these parts will be used to layer the cake and the other will be ground in the mixer.