Wash and deseed the red dates, soak it for an hour. Bring 800ml water to boil, add in red dates, bring it to boil again and simmer for 20 minutes until softened.
Blend the red dates and water into puree. Then sift the puree.
Add the puree and sugar in a pot, cook under medium heat until sugar dissolved, set aside until warm.
Mix the tapioca flour, glutinous rice flour and water chestnut flour together. Gradually add the red date syrup, mix well until smooth.
Brush a layer of oil in a tin, then pour into the batter. Steam on medium heat for one hour.