Banana steamed cake

I was very keen to try steaming the banana cake right after i read Sasha's post, so off i went to prepare everything and steamed it yesterday night. It actually looked like over-steamed and the cake tasted bitter too. I cracked my head why the cake turned out differently even though i follow every steps that stated in the recipe. And finally i managed to get known the bitter taste is due to the baking soda i put. It should be baking powder not baking soda. I got this after i read the original post at Chow Times's blog.