FOR THE SALAD:
8 ounces dried udon noodles
1 to 2 tablespoons furikake or sesame seeds
10 to 12 ounces tuna in oil, drained
2 scallions, trimmed and thinly sliced
FOR THE DRESSING:
2 tablespoons sesame oil
2 tablespoons canola oil
2 tablespoons rice wine vinegar
1 tablespoon mirin
1 tablespoon soy sauce
1 teaspoon sweet miso
Cook the noodles according to the package instructions.
Meanwhile, prepare the dressing: In a measuring cup or bowl, whisk to combine the sesame oil, canola oil, rice wine vinegar, mirin, soy sauce and miso; set aside.
In a small skillet, lightly toast the sesame seeds, if using, over medium-low heat until fragrant; set aside.
Drain the cooked noodles in the colander, then transfer to a wide, shallow serving bowl. Add the wakame and about 3/4 of the dressing, and toss to coat. Divide the noodles among 4 bowls. Top each portion with tuna, drizzle with the remaining dressing, then sprinkle with the scallions and furikake or sesame seeds. Serve hot, cold or anywhere in between.