In a small bowl, combine the wasabi powder and water and mix together to create a paste. Let sit 10 minutes for the flavours to develop. If using wasabi paste, you can skip this step.
Stir in the mayonnaise until well combined.
Pat the scallops very dry and season well with salt and pepper.
Heat the butter in a medium skillet over medium high heat. When it begins to brown, add the scallops in one layer and sear about 1 1/2 minutes per side.
Set the scallops on a platter and dollop each with a bit of the wasabi mayo. Top with a small piece of pickled ginger and a piece of chive. Serve warm.
Notes
Serves 2 as a meal. Each serving has 6.88g of carbs. (as an appetizer, it can serve 4, so divide the nutritional counts in half). Food energy: 281kcal Total fat: 17.10g Calories from fat: 153 Cholesterol: 61mg Carbohydrate: 6.88g Total dietary fiber: 0.08g Protein: 23.38g