In a large bowl, whisk together soy sauce, 2 tablespoons sesame oil, rice vinegar, sriracha, honey, garlic, and ginger.

Slowly whisk in vegetable oil until combined.

Place steak in a shallow baking dish and pour 1/3 of soy mixture over steak.

Let sit for 10 minutes.

Bring a large pot of water to a boil.

Cook soba noodles according to package directions.

Drain and rinse with cold water.

In a large bowl, toss noodles with carrot, cucumber, half of the green onions, and sesame seeds.

Pour remaining soy mixture over noodles and toss gently.

Heat a lightly oiled grill pan or grill over high heat.

Remove steak from marinade and season with salt and pepper (discard marinade).

Grill steak 5 minutes per side for medium.

Let rest for 5 minutes before thinly slicing on the diagonal.

Serve steak over soba noodle salad.

Drizzle with remaining 1 tablespoon sesame oil and garnish with remaining green onions.