01 - Combine beef slices with 1 tbsp soy sauce and cornstarch in a bowl. Set aside 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 skillet or wok over high heat with a splash of oil. Cook beef in batches, searing each for 2–3 minutes until browned and just cooked. Remove and set aside.
04 - Add more oil if needed to the skillet. 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 heated through and coated evenly.
06 - Dish spicy beef and vegetables over steamed rice. Garnish with sliced spring onions, toasted sesame seeds, and fresh cilantro if desired.