Add the water and sugar to a small saucepan. Heat it over high heat and whisk constantly until the sugar is dissolved and the water is boiling.
In a medium bowl, add the glutinous rice flour. Pour in the water and mix until a smooth dough forms. Cover with plastic wrap and let it rest for 20 minutes.
Divide the dough and red bean paste into 6 equal portions each. For the dough, I took the total weight of the dough and divided by 6.
Take a piece of dough and use your thumb to make a small well in the center. Put the piece of red bean in the well.
Enclose the filling then roll the ball between your palms to form a smooth ball.
Place the ball in a shallow dish of sesame seeds and roll until evenly coated. Set aside and repeat with the remaining dough.
Heat 2 inches of oil to 265°F in a large pot over medium heat. Gently lower the sesame balls into the oil; the oil temperature should decrease to 250°F. Try to maintain a temperature between 250-265℉.
From 0-6 minutes, the sesame balls will sit at the bottom of the oil. You can just let them cook undisturbed. But usually, at 3 minutes, I will flip them over so they cook a bit more evenly.
From 6-10 minutes, the sesame balls will begin to float. During this time, use a metal spider to constantly move and rotate them around the oil.
At the 10-minute mark, increase the heat to medium-high and continue frying the balls for 5 minutes, moving and rotating them constantly until they develop a golden brown color. You can use your metal spider to gently push them into the oil; this will make them puff up slightly more.
Remove the sesame balls to a wire rack to drain excess oil. Enjoy!