Toast peanuts over medium heat, for 3-5 minutes, until aromatic. Remove peanuts and let cool.
Add peanuts to a food processor and blitz together with the sugar, until it becomes a coarse powder.
Place in a small mixing bowl and mix with the peanut butter, icing sugar, and coconut oil until it forms a firm consistency
Cover with plastic wrap and place into the fridge to stiffen.
For the dumpling, mix glutinous flour with water and knead with hands to form a dough. The dough is done when it isn’t sticky anymore.
Break off small pieces of dough, about the size of a ping pong ball. Use your thumb to make an indent.
Place a small portion of the peanut filling in the center of the dough ball and pinch the dough closed. Roll to form a ball. Repeat with the remainder.
Bring a large pot of water to a boil and gently slide in some Tang Yuan in. When all the balls start to float on the surface cook it for one minute longer.