Toast: My wife had baked a loaf of white bread previously which was sliced and frozen. She toasted and then buttered it.
Assembly: I layered the creamy scramble eggs, chopped chives and then sea urchin (for two servings, I used a whole tray, 80 grams). I garnished it with strips of nori (I added more after taking picture) and a side of real wasabi. I sprinkled Kosher salt and white pepper and more chopped chives as well.