01 - Toss beef slices with 1 tbsp soy sauce and cornstarch in a medium bowl and let rest for 10 minutes.
02 - Whisk together remaining soy sauce, sriracha, hoisin sauce, brown sugar, rice vinegar, garlic, ginger, and sesame oil in a small bowl.
03 - Heat a large skillet or wok over high heat, add oil, and sear beef in batches for 2–3 minutes until browned and cooked through. Remove and set aside.
04 - Add more oil if needed to the skillet and stir-fry bell pepper, snap peas, and carrot for 2–3 minutes until tender-crisp.
05 - Return beef to skillet, pour in spicy sauce, and toss over high heat for 1–2 minutes until evenly coated and heated through.
06 - Spoon beef and vegetables over steamed rice and garnish with spring onions, sesame seeds, and cilantro if desired.