Peel and boil the sweet potatoes, then mash them.
Add eggs, sugar, honey, and milk to the sweet potatoes, and mix well.
Sift in flour and baking powder, then knead into a batter.
Add melted butter and mix thoroughly.
Pour the batter into a cake mold.
Bake in a preheated oven at 170°C for 40 minutes.
Cool, then remove from the mold.