Vibrant colorful tangyuan made with natural vegetable dyes are a beautiful festival dessert. A fun family treat with sweet filling and festive presentation.
Prepare natural vegetable colors: Puree steamed purple sweet potato for purple, spinach for green, and pumpkin for yellow. Allow to cool before using.
Divide the glutinous rice flour into four equal portions. Mix one portion with boiling water until a smooth dough forms; knead the other portions separately with the cooled vegetable purees and boiling water to create different colored doughs (white, purple, green, yellow).
Roll each dough portion into a long rope, then cut into equal pieces (about 1 inch). Flatten a piece in your palm, place 1/2 tsp sweet red bean paste or black sesame paste in the center, then seal and roll into a smooth ball. Repeat with remaining dough and fillings.
Bring a large pot of water to a rolling boil. Carefully drop the tangyuan into boiling water. Stir gently to prevent sticking. When they float, continue to cook for 1–2 minutes to ensure fully cooked centers.
Separately, in a saucepan, combine 3 cups water, sugar, and sliced ginger. Bring to a boil, then reduce heat and simmer for 5 minutes. Serve tangyuan in bowls with hot ginger syrup.