In a bowl, mix mashed sweet potato, shredded coconut, coconut sugar and 2 tablespoons of coconut milk. Keep it aside.
Put around 1 cup of tapioca flour in a large bowl. Pour around 1/2 a cup of boiling water. Mix with the help of a spoon until everything starts coming together. Add the remaining flour. Keep on adding more boiling water and knead until a smooth elastic dough gets formed.
Cover the dough with a plastic wrap or a wet kitchen towel. Just make sure that the wet towel doesn't touch the dough.
While we make the dumplings put a large pot of water for boiling.
Take a small portion of dough in your hands and press it between your palms to make a thin flat disc. You can also put the dough ball between a plastic wrap and then press to make the disc.
Keep a small portion of the sweet potato filling at the center, bring all the edges together, and seal. Gently roll the ball between your palms to give it a neat round shape. Repeat this process with the remaining dough. Keep the dumplings covered with a plastic wrap or wet cloth until you start cooking them.
Put dumplings in boiling water and cook for 3-4 minutes or until they start floating on the boiling water.
Fill a large bowl with coconut milk and put cooked dumplings in the milk.
Sprinkle some toasted sesame seeds and enjoy!