1Dice tomato and cucumbers into small cubes, dice lettuce into smaller pieces, and slice the onion.
2Slice beef into 1-inch cubes.
3In a bowl, add beef, oyster sauce, soy sauce, salt, pepper, cornstarch, baking soda, and garlic; mix well.
4On medium heat, in a pan coated with spray oil, grill the meat until almost cooked through; add sliced red onions and sauté.
5In a meal prep container, add steamed rice topped with shaken beef. On the side, add a salad of tomato and cucumber slices with chopped lettuce. Top with additional pepper.