In a baking sheet, lined with a few layers of paper towels. Set aside.
In a medium bowl, add 100g glutinous rice flour. Slowly pour in ½ cup cold water. Stir and mix with one hand until the dough comes together. If it is too dry, add little more water. If it is too wet, add little more flour. Pinch the dough into about 1-inch irregular pieces.
In a medium pot, add 1 cup water and the brown sugar. Bring to a boil and reduce to medium-low heat. Cook until the sugar has melted. Add the dough pieces and cook through, about 3 – 5 minutes. Turn the heat off. Add 150g rice flour. Stir together with a wooden spatula.
On a lightly floured (rice flour) working surface, place the hot dough over. Add another 40g of rice flour. Carefully knead the dough until smooth. If the dough is sticky, add little more flour. Divide the dough into 2 parts.
Roll 1 part of dough into ¼-inch thick with a rolling pin. Use a 3½-inch round cutter to cut out rounds. Repeat with the other part of dough. Gather the scrapes and roll it into ¼-inch thick dough again. Continue to cut out rounds. Make 15 – 17 rounds in total.
Place about 1 tablespoon red bean paste in the center of each round. Fold the dough over to make half-moon shape. Press the edges firmly to seal.
In a wok or medium pot, add enough vegetable oil to reach 1-inch deep. Heat the oil to 350˚F (160˚C). Fry the puffs in patches until golden brown, turning them often for even cooking. Transfer the finished puffs to the prepared baking sheet. Let them drain and rest for 10 minutes before serving.