Butter cake is one of my favourites but I don’t bake them as frequently compared to chiffon cakes as the former are quite laden with calories. So butter cakes are once in a while treat for me. I have made this cake a few years back and its really delicious. I bought some purple sweet potato and would like to bake this again. I am setting aside some sweet potato to bake a bread. So stay tuned for that.
This cake didn’t quite yield the same texture and taste when I baked this in 2015. It had a more kueh like texture this time. I suspect I accidentally added more liquid then I should.
Ingredients (adapted from lykitchenventure.blogspot.com)
200g salted butter
85g sugar
4 egg yolks
1 tsp vanilla extract
200g self raising flour
80g milk
150g mashed purple sweet potato
1 tbsp lemon juice
4 egg whites
50g sugar
Stream and mash the purple sweet potato. Mix the 80g milk and lemon and set aside. The acidity from the lemon will help the colour to stay vibrant after baked.
Pre-heat the oven to 160d. Line the base of a 8 inch square pan and grease the sides of the pan. I decided to use a bundt mould to bake this. The bundt needs to be well greased also, you don’t want the cake to break during unmoulding.
Cream butter and sugar until fluffy. Add in the one egg yolk and cream till well blended before you continue with another yolk. Add in the prepared sweet potato mixture and mix well. Add in the sifted flour and mix well.
In another clean bowl, whisk the egg whites until frothy. Add in the 50g sugar and continue to whisk till stiff peak.
Fold in 1/2 of the meringue and mix well before adding the balance 1/2.
Bake in the over for 45mins to 50mins or until cooked. Test to see if the skewer comes out clean. Allow the cake to cool before you unmould.
I love the vibrant colour I got this time. The photo on the bottom right is what it looked when I made this years back. Should have been a bit more light and crumbly.