Add the water into a pot.
Then add in the salt...
And sugar. Give the water a taste and adjust the sweetness accordingly.
Bring the water, salt and sugar mixture to a boil.
Meanwhile, in a separate bowl, add 15 tsp tapioca flour and 16 tsp of water and mix well until there's no clumps. This will act as a thickening agent for the dessert.
With a spoon in one hand and the tapioca/water mixture in the other, while stirring the pot, slowly pour the tapioca/water mixture into the pot.
Continue stirring until the mixture thickens. Approximately 30 minutes. You will notice that the mixture will start to come to a boil. Continuous stirring will prevent the bottom from burning.
After the mixture has thicken, add in the steamed peeled mung beans, vanilla extract, while continuing to stir. Then immediately turn off the heat to prevent burning. And there you have it, a traditional Vietnamese dessert called chè đường.