Steamed dual layer banana sponge cake

Recipe:

Banana cake layer

2 big banana (pisang berangan)

1 tsp baking soda

3 eggs

1 Tbsp molasses sugar

100g superfine flour

1 tsp baking powder

1 Tbsp coconut oil

Sponge cake layer

2 eggs

1 tsp molasses sugar

3 Tbsp natural yogurt

65 g pao flour

1/2 local lemon (juiced)

P/S: Using a 7" baking pan

Banana cake 

(1) Mix banana and baking soda, set aside.

(2) Beat eggs till foamy, add in sugar and continue to beat till ribbon stage.

(3) In sequence, mix in: sieved flour, baking powder, banana mixture in no.1 and oil. Fold till all mix.

(4) Steam in preheated steamer for 15 minutes. Once done, remove from steamer and set aside.

Sponge cake 

(1) Beat eggs till foamy, add in sugar and continue to beat till ribbon stage.

(2) Add in yogurt and lemon juice. Sieved in flour and fold till all mix.

(3) Pour the batter on top of banana cake and further steam for another 15 minutes.

Results: 

The banana cake layer is very soft and fluffy. 

However, for the sponge cake layer there were few things that took place. First - i have replaced the original recipe that calls for milk to yogurt. Second, during steaming - after pour in the batter on top of banana cake layer, towards the end, the cloth wrapping the lid cover touches the top part of the cake as it rises thus might have affected it to collapse after rises. Thirdly, i have reduced the sugar to only 1 tsp. These pointers shall use as reference for future improvement.

Adapted from :

http://auntyyochana.blogspot.com/2008/04/steamed-soft-banana-cake.html
http://honeybeesweets88.blogspot.com/2010/01/strawberry-muffins-and-steamed-moist.html