1Dice tomato and cucumbers into small cubes. Dice lettuce into smaller pieces. Slice the onion.
2Slice beef into 1-inch cubes.
3In a bowl, mix beef with oyster sauce, soy sauce, salt, pepper, cornstarch, baking soda, and garlic.
4Grill the marinated beef in a pan over medium heat with cooking spray oil until almost cooked through. Add sliced red onions and sauté.
5In a meal prep container, add steamed rice, topped with shaken beef. Add a side salad of diced tomato, cucumber, and lettuce. Top with pepper.
6To reheat, store the salad and meat separately to avoid soggy rice. Microwave rice with a wet paper towel, then add meat and microwave until warm. Add vegetables last to preserve crunch.