Chewy sesame tang yuan in sweet soup make a warm, nutty dessert. A family treat with rich black sesame flavor and comforting broth.
Toast the black sesame seeds in a dry skillet over medium heat, stirring constantly, until fragrant (about 4 minutes). Cool before use.
Grind the toasted sesame seeds to a fine powder in a food processor. Add powdered sugar and unsalted butter, pulsing until it forms a paste. Chill until firm.
In a mixing bowl, combine glutinous rice flour and gradually mix in water until a smooth, soft dough forms. Knead for 2 minutes for even texture.
Divide the dough into 16 pieces. Flatten each and wrap a small portion of chilled sesame paste inside, sealing tightly to prevent leaks.
Bring a large pot of water to a boil. Add tang yuan, stir gently to avoid sticking, and cook until they float plus 2 extra minutes for doneness.
In a separate saucepan, combine 4 cups water, granulated sugar, and ginger slices. Simmer over medium heat for 5 minutes to infuse flavor.
Transfer cooked tang yuan into the warm ginger syrup. Serve hot with a scoop of broth in each bowl.