Wasabi Vinaigrette: Place all ingredients except olive oil in blender. Process on low. Slowly add olive oil until it becomes emulsified (a mayonnaise-like consistency).
Cucumber Salsa: Mix all ingredients.
Place the cooked fish (cooked as desired: baked, broiled, etc..) in a serving platter.
Top with the Cucumber Salsa.
Then, either drizzle the Wasabi vinaigrette over the fish or place the vinaigrette around the edges of the fish.