Toast the black sesame seeds in a skillet over medium heat, stirring constantly, until fragrant. This should take about 3-5 minutes. Toasting enhances their flavor.
Place the toasted sesame seeds in a food processor, add the sugar and butter, and grind into a fine, thick paste. Refrigerate for 15 minutes to make it easier to handle.
Gradually mix the glutinous rice flour with the warm water. First, stir with a spoon, then knead by hand until you have a smooth, pliable dough. If it's too dry, add a little more water.
Divide the dough into small pieces and roll them into balls. Flatten the center of each ball and add a small amount of sesame filling. Gently close the dough around the filling and reshape into a ball.
Bring a large pot of water to a boil. Carefully drop the tang yuan into the boiling water. Once they float to the surface, cook for another 2-3 minutes. Avoid stirring vigorously to prevent them from breaking.
Remove the cooked tang yuan with a slotted spoon and serve warm in the cooking liquid. The sweet, molten sesame filling will melt softly inside.
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