Brush your mold with a little oil, place it onto a steamer pot which already filled with enough water. Bring to boil.
Mix ingredients for bottom layer
Strain the mixture so no lumps
Pour this mixture into prepared mold that's been heated and steam for 20 minutes (covered obviously)
Mix ingredients for top layer
Strain as well, set aside
Once 20 minutes mark is up, slice a banana, and place all over the cake, and steam for another 10 -15 minutes
Take off lid and slice another banana. Place all over the cake and slowly pour the top layer mixture. Place the lid back, and steam for 30-45 minutes
Cool cake completely before removing from mold and slicing