Soak the red beans for few hours, then cook the red beans until soften but not mashy. (Do not add sugar when you cook red beans)

Mix 300ml water with wheat starch and rice flour together. Bring 600 ml water to boil, add sugar and cook until it dissolved. 

Gently add in syrup into the mixture, keep stirring until smooth. 

Steam the bowls for few minutes, then stir the mixture, pour the mixture into bowls and add in red beans. Steam for 10-15 minutes, use a toothpick to test if a mixture stick on it.  Let it cool and take the pudding out.