Boil the soba noodles according to package directions until al dente, then drain and set aside.
Season the beef sirloin strips evenly with sea salt and black pepper.
Heat the toasted sesame oil in a large skillet or wok over medium-high heat until shimmering.
Add the beef strips to the pan and sear until browned on all sides, approximately 3-4 minutes, then remove the beef and set aside.
In the same skillet, add the broccoli florets and sliced red bell pepper with one tablespoon of water, sautéing until the vegetables are vibrant and crisp-tender.
Stir in the minced garlic and grated fresh ginger, cooking for 1 minute until highly fragrant.
Return the beef to the skillet and add the cooked soba noodles.
In a small bowl, whisk together the tamari and honey, then pour the sauce over the beef and noodle mixture.
Toss everything together for 1-2 minutes until the sauce has thickened slightly and all ingredients are well-coated and heated through.