Peel and chop the medium-sized starchy potatoes into cubes. Boil in salted water for about 15 minutes until fork-tender.

Drain potatoes and mash until smooth. Let cool slightly before mixing with other ingredients.

Combine mashed potatoes, glutinous rice flour, sugar, and water to form a dough. Knead for about 5 minutes.

Dust surface with glutinous rice flour, divide dough into small portions, and roll each into logs about 6 inches long.

Heat oil in a frying pan over medium heat. Fry the rolls for 3-5 minutes on each side until golden-brown.

Transfer fried rolls to paper towels to drain excess oil. Drizzle with soy sauce and sprinkle with sesame seeds and green onions before serving.