In a bowl mix all the ingredients for the dressing.
Pour half of the dressing onto the base of a serving plate, then arrange the fish slices around the edge, placing them on top of the dressing.
In a small saucepan, gently warm the olive oil and both types of sesame oil, making sure they do not come to a boil.
Dip a warm spoon into the saucepan of oils and gently glide it over the surface of the fish slices, as if caressing them.
Drizzle the remaining dressing over the fish, then sprinkle with both white and black sesame seeds.
Place one stick of the green part of the onion on each salmon slice, then sprinkle all the slices with the finely chopped white part.
Add a small amount of green salad to the center of the plate and serve.
The key to this recipe lies in using fresh, high-quality fish and slicing it thinly with a sharp knife. Thin slices allow the dressing to fully infuse the fish, resulting in a delicate and refined flavor experience.