Rinse black and white sesame seeds under running water.
Toast sesame seeds in dry frying pan over medium or medium-low heat until the sesame seeds start popping, it takes about 10 minutes. Toasting time may differ depending on your cooking temperature.
Grind the sesame seeds with a blender/food processor until fine. Add in fine granulated sugar, butter and vegetable oil, process into paste. Refrigerate for at least 30 minutes.
Glutinous rice ball: Add 30 ml of hot water to 50 g of glutinous rice flour, mix well. Then add in 30 ml of plain water and another 50 g of glutinous rice flour, continue mixing until a dough is formed. Partially cook dough add extra chewiness to the rice ball. Keep kneading until smooth dough is formed, additional 4 teaspoon of water is added, one tsp at a time to adjust the consistency of the dough. You may add in some extra flour if the dough is slightly sticky.
Divide the dough into 9 portions, 20g each. Roll black sesame filling into ball, 8g each. Flatten the dough, top with filling, then fully wrapped filling with dough, roll into ball again.
Bring a large pot of water to the boil, add in rice balls. The rice ball is cooked when it floats to the surface of water. Remove the rice balls with strainer and dip the cooked rice balls in cold water until fully cooled.
Serve glutinous rice balls with ginger syrup or sweet soup.
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Notes
This recipe yields 9 glutinous rice balls. The nutritional value for reference is for 1 glutinous rice ball.