Place the mussels in a large pot with enough water to cover the mussels. Bring the water to a boil and cook over high heat for about 1 mins until the mussel shells have opened. Drain the mussels. Rinse the mussels under cold running water.
Remove them from their shells and place in a plate lined with paper towel.
Well combine the soy sauce, cold water, cornstarch and some salt, set aside.
Heat 2 tbsp oil in a pan on high, stir fry ginger for 15 seconds, add mussels and stir for another minute. Add the sauce and sliced spring onions. Stir well until the sauce becomes sticky and mussels are well coated.