Begin by slicing the steak into 1/4-inch strips, against the grain.
In a large skillet on medium heat, add in the soy sauce, 1/4 cup water, rice vinegar, brown sugar, granulated sugar, garlic clove, and ginger. Let this simmer for about 3-5 minutes.
Once simmered add in the steak and cook the steak until your preferred doneness.
While the steak is cooking, add in the cornstarch to thicken up the sauce.
In a separate skillet, add in the vegetables and oil, and then cook on medium heat until soft.
Once the steak and veggies are done, build your bowl with the rice, vegetables, and steak.