Microwave the unpeeled sweet potato until soft. (The peel acts as a substitute for plastic wrap.)
Peel the sweet potato and mash while still hot. (Start to preheat the oven to 180°C.)
Add the butter (margarine) to the sweet potato and mix.
Mix in the pancake mix and milk (or soy milk), then pour the batter into the tin. Bake in the oven for 20-30 minutes. Keep an eye on it while it is baking.
Poke a toothpick through the middle. It is done if the toothpick comes out clean It's tasty served with heavy whipped cream.
Story Behind this Recipe
I had lots of sweet potatoes, so I made a cake which my son, who is allergic to eggs, could enjoy.
Black sesame seeds might give a more attractive finish, but I only had white sesame seeds, so if that's what you have too, it will look like the top photo. It has a very mild sweetness, so add some sugar or sweet cream if you'd prefer it to be a little sweeter.