To make dressing, heat peanut oil in a small sauce pan over medium heat until hot. Put ginger in a heat proof bowl and pour peanut oil on top. Let sit for 1 minute, add remaining ingredients and whisk. Set aside.
Fill a large pot with salted water and bring to a boil. Carefully add dumplings. Cook for 6 minutes, stirring once.
Remove dumplings with a slotted spoon to a platter. Drizzle some of the dressing over the dumplings and place remaining dressing in a bowl to pass.