Ginger Syrup: Boil the water in a pot. Add the ginger and pandan leaves, and bring to a boil over medium heat until the aromas of ginger and pandan become fragrant. Add the sugar and let it simmer for another 15 minutes. Adjust the sugar to taste, if desired. Discard the ginger and pandan leaves, then set the syrup aside.
Tang Yuan (Glutinous Rice Dumplings): In a mixing bowl, combine the glutinous rice flour with water and knead with your hands to form a dough. The dough is ready when it no longer sticks to your hands.
Divide the dough into three portions, making the plain dough the largest. Add 2-3 drops of food coloring to the other portions to create the pink and yellow/orange dough.
Pinch the dough into small portions and set them aside on a flat surface dusted with glutinous rice flour or lined with parchment paper. If the dough dries up, wet your hands with a bit of water.
Roll them between your palms to form round balls.
Boil another pot of water and drop the tang yuan into the boiling water. Once they float to the surface, transfer them into the syrup. Serve immediately.