Boil the palm sugar, 100g water and pandan leaves over low heat until the palm sugar paste is completely melted and filter it. Then, add water to get 500ml palm sugar paste.
Add rice flour, tapioca flour and alkaline water and stir evenly. Put it into the pot for a little bit at least to make it thick (here you must keep stirring).
Put the cup in the steamer and steam for five minutes on high heat, then take it out. Pour the paste of method (2) into the preheated cup until it is 80% full.
Put it in the steamer and steam for about 15 minutes or until cooked.
Add salt to the shredded white coconut, mix well, add pandan leaves, and steam over high heat for 5 minutes.
After cooling, take out the pastry and serve with shredded coconut.