Place the regular and glutinous rice flour, and salt, into a bowl then mix with your hands.
Add water to the bowl while continuing to mix the batter with your hands.
Crack the duck egg and empty its contents into the mix.
Add palm and white sugar to the batter.
Mix the batter with your hands for 2-3 minutes, or until it achieves a uniform consistency.
In a wok, skillet, or pot, heat enough cooking oil to deep-fry the pancakes; a depth of 1 ½ inches should suffice.
Use a ladle to pour roughly ¼ cup of the batter into a measuring cup. Then, pour the batter you've just measured into the hot oil and allow to fry for 2-3 minutes.
Use a pair of chopsticks to check the underside of the pancake; if it's turned a golden-orange, go ahead and flip the pancake.
Once both sides of the pancake have the same golden-orange color and the edges are slightly brown, remove the pancake from the oil and set aside to cool on a plate. Repeat steps 7-9 until you're out of batter.
Serve the pancakes warm with a helping of your favorite jam!