01 - In a mixing bowl, combine the diced tuna with mayonnaise, Sriracha, soy sauce, sesame oil, and rice vinegar. Toss gently to coat evenly, then refrigerate for at least 10 minutes to allow the flavors to meld.
02 - Bring a large pot of water to a rolling boil. Add the udon noodles and cook according to package directions until tender but still chewy. Drain and rinse briefly under cold water to halt cooking, then set aside.
03 - In a separate saucepan, combine the dashi broth, soy sauce, mirin, and sugar. Bring to a gentle simmer over medium heat, stirring until the sugar dissolves completely.
04 - Divide the cooked noodles evenly between two serving bowls. Ladle the hot broth over the noodles, ensuring they are fully submerged.
05 - Spoon the marinated tuna mixture generously over each bowl of noodles and broth.
06 - Top with sliced green onions, shredded nori, toasted sesame seeds, and julienned cucumber. Drizzle with chili oil and add pickled ginger if desired. Serve immediately while hot.