In the top of a double boiler, combine the syrupy rice wine, superfine sugar, and dark bean paste. Stir over medium heat until glossy and bubbly (about 2 minutes). Remove the pan from the heat and stir in the rice vinegar and water. Place the pan over a bowl of ice, or chill in the refrigerator until no longer warm. With a whisk, beat in the walnut oil.
In a clean, dry skillet, dry-roas