In a large saucepan of boiling salted water, blanch the spinach for about 1 minute, or until leaves are just wilted. Drain and rinse under cold water until the spinach is thoroughly cooled. Drain well and wrap spinach in clean, dry towel. Squeeze to remove excess moisture. Place spinach in medium bowl, sprinkle on sesame oil, rice wine vinegar, and salt and toss to mix. Set aside until ready to use. Sprinkle with sesame seeds for garnish just before serving.
Place a portion of the Sesame Spinach in the center of 4 plates. Or, place spinach on 1 large platter for buffet or family-style serving. Arrange 6 geoduck slices around the spinach. Drizzle some sauce on the geoduck and garnish with a sprinkling of green onions. Serve a bit of the sauce on the side as a dipping sauce, if desired. Place pickled ginger in center of salad in a mound.
In a small saucepan over medium heat, combine shallots, garlic, Asian barbecue sauce, hot bean sauce, and hoisin sauce and cook for 30 seconds. Add wine and cook for 1 minute. Add soy sauce, stock and sugar and cook for 2 minutes. Adjust with sugar, to taste. Transfer mixture to a blender and process until liquefied. Let cool.;