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 up to 2 hours refrigerated.
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 nicely browned and cooked through. Transfer to a plate and set aside.
04 - Add the remaining 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 and bring to a simmer for 1 to 2 minutes until slightly thickened. Return the steaks to the pan and cook for 1 to 2 minutes, turning to coat evenly with the sauce and vegetables.
06 - Serve immediately while hot, garnished with sliced green onions and toasted sesame seeds.