Make the Marinade: In a bowl, mix together soy sauce, oyster sauce, honey, water, minced garlic, and black pepper.
Marinate the Beef: Add sliced beef to the marinade. Stir to coat well and set aside to marinate.
Prepare Rice and Vegetables: Rinse the rice and add it to the rice cooker with 1 cup of water. Add diced onion, carrots, bell pepper, and frozen corn on top of the rice. Optional: Add a small pat of butter (about 1 tbsp) for extra flavor.
Cook: Turn the rice cooker on and let it cook.
Finish and Serve: Once the rice cooker is done, garnish with sliced green onions if desired and serve hot.
