01 - In a mixing bowl, whisk together the soy sauce, oyster sauce, rice vinegar, honey, minced garlic, grated ginger, sesame oil, and black pepper until well combined.
02 - Place the cube steaks in a shallow dish or resealable plastic bag. Pour the marinade over the steaks, turning to coat evenly. Allow to marinate for at least 10 minutes at room temperature, or refrigerate for up to 2 hours for deeper flavor penetration.
03 - Heat 1 tablespoon of vegetable oil in a large skillet over medium-high heat. Remove the steaks from the marinade, reserving the liquid. Sear the steaks for 2 to 3 minutes per side until deeply browned and cooked through. Transfer to a plate and set aside.
04 - Add the remaining 1 tablespoon of vegetable oil to the same skillet. Sauté the sliced onion and bell pepper for 3 to 4 minutes until softened and lightly caramelized.
05 - Pour the reserved marinade into the skillet with the vegetables and bring to a simmer. Cook for 1 to 2 minutes until the sauce slightly thickens. Return the steaks to the pan and cook for an additional 1 to 2 minutes, turning to coat evenly with the sauce and vegetables.
06 - Transfer to serving plates and garnish with sliced green onions and toasted sesame seeds. Serve immediately alongside steamed jasmine rice or sautéed greens.