01 - Toss beef slices with 1 tablespoon soy sauce and cornstarch in a bowl. Let marinate for 10 minutes.
02 - Combine remaining soy sauce, sriracha, hoisin sauce, brown sugar, rice vinegar, garlic, ginger, and sesame oil in a small bowl and whisk until smooth.
03 - Heat a large skillet or wok over high heat. Add a splash of oil and sear beef in batches until browned and just cooked, about 2 to 3 minutes. Remove and set aside.
04 - Add more oil if needed to the skillet. Stir-fry bell pepper, snap peas, and carrot for 2 to 3 minutes until tender-crisp.
05 - Return beef to skillet, pour in spicy sauce, and toss over high heat for 1 to 2 minutes until heated through and evenly coated.
06 - Spoon beef and vegetables over steamed rice. Garnish with spring onions, toasted sesame seeds, and fresh cilantro if desired.