Chè Củ Năng (Water Chestnut Tong Sui)

Ingredients:
-1/2lb water chestnuts
-water (approx. 2 1/2 cups)
-3 tbs tapioca starch
-rock sugar (to taste)
-sesame seeds

What to Do:
Peel water chestnuts and blend with water in a blender. Boil mixture and add rock sugar to taste. Mix starch with water to make a slurry, add slurry slowly into chestnuts until slightly thick. Serve hot garnished with a few toasted sesame seeds.