In a saucepan, boil one and a half cups of water with pandan leaves and palm sugar/gula melaka. Stir to make sure all the sugar is dissolved. Add butter. Turn the fire off. Set aside and allow to cool.

In a separate bowl, sift the flour, baking powder and baking soda. Add salt to the sifted flour. 

Mash four bananas in a small bowl with a fork. Stir in vanilla extract and set aside.

In a mixing bowl, using a mixer, whisk eggs and white sugar until fluffy and light yellow. Next, fold in half the flour mixture. Stir to combine. Fold in the rest of the flour and stir again. Add in the mashed bananas.

Pour in the palm sugar and butter mixture a third at a time. Mix it all up until you get a smooth batter. 

Thinly slice two bananas. Grease your moulds, baking tin or loaf pan with some butter. Pour in the batter halfway. Top with banana slices & bits of walnut. 

You can choose to steam or bake this banana bread. Place in a steamer for 1 hour or until a skewer inserted into the centre comes out clean. Allow to cool completely before cutting in or the consistency will be more like pudding. Or bake in the oven at 180ºC (360ºF) for 45 minutes. This produces a more caramelized flavour than the steamed version, but both are fluffy, moist and light.