In a mixing bowl, combine the first 5 ingredients. Set aside.
Bring a pot of water to a boil. Add the noodles and cook for 2-3 minutes until just tender. Drain and rinse under cold water.
Shake off most of the water on the noodles and pour into a large mixing bowl. Drizzle a small amount of sesame oil over the noodles and mix them to keep them from sticking.
Pour the sauce over the noodles and mix to combine thoroughly.
At this point, you may assemble your noodles or cover and chill them until ready to serve.
If serving immediately, divide the noodles among two serving bowls. Top each bowl with the cucumber, boiled egg halves, and sliced nori.
Pour any residual sauce on top of the noodles and serve.