Late-Night Japanese Noodles

In a bowl, gently stir the mayonnaise with the mentaiko, sesame oil and 1/2 cup of water.

In a large, deep skillet, combine the noodles with the chicken broth and bring to a boil. Cover and cook over moderately high heat until the noodles are softened and the broth is nearly absorbed, about 3 minutes. Add the grapeseed oil, then stir in the mushrooms and scallions and cook, stirring occasionally, until the broth is completely absorbed and the scallions are softened, about 2 minutes. Stir in the mentaiko sauce and cook, tossing, just until the noodles are evenly coated. Garnish with the shiso and nori and serve.