Purple Sweet Potato Steamed Cake

I remembered the first time I came across Japanese steamed cake... at Ion's food hall (B4)., the array of colours was totally eye-catching. Recently, I came across a post by Ellena of Cuisine Paradise, her steamed cakes look sooo beautiful and tasty! Inspired.... and tried her recipe using my leftover purple sweet potato, result was not bad, but I find them a tad too dry, next time shall try making another flavour and adding more water :)

Purple Sweet Potato Steamed Cake
Adapted from:  Cuisine Paradise

Ingredients: (makes 4)
100g Plain Flour
1 tsp Baking Powder
25g Caster Sugar
1 Large Egg, 60g
50ml Water
1 purple sweet potato (about 120g)

Preparation for the sweet potato:
Peel the sweet potato and steam for 15 min till soft, cut it into two. Mash one part with a fork and mix with 50ml of water, dice the other half of it into small cubes.

Directions:
1. Sift flour and baking powder in a bowl. Set aside. At the same time, preheat a steamer/wok filled with water till boiling point.
2. Using a balloon whisk, beat egg and sugar together till foamy and pale in colour.
3. Divide the sifted flour into two batches, stir in alternately with the mashed sweet potato mixture to form a smooth batter. Add additional water if  neccessary.
4. Spoon the cake batter evenly into 4 prepared foil/ramekins cups that are lined with paper liners. Add the diced sweet potato cubes as topping.
6. Place the cups in the steamer/wok(with boiling water in it), cover and steam over high heat for about 12-15 minutes(depending on the size) or until a skewer inserted into one of the buns comes out clean.