Heat the vegetable oil in a large skillet over medium-high heat.
Add the chicken to a large bowl and toss with the vegetable oil, salt, and pepper.
Once the skillet is hot, cook the chicken on high heat for about 3-5 minutes on each side.
In a saucepan, whisk together the soy sauce, water, rice vinegar, honey, brown sugar, minced garlic, and grated ginger.
While the chicken is cooking, bring the soy sauce mixutre to a boil over medium heat. Once boiling, reduce the heat to simmer and allow it to cook for another 2-3 minutes.
In a separate small bowl, mix the cornstarch and water to make a slurry. then add it to the sauce. Keep simmering the mixture until it thickens.
Pour the sauce over the chicken on low heat and allow it to sit on the heat for a minute or two to really absorb all of the flavors.
Remove the skillet from the heat and let the chicken rest for a few minutes. Slice the chicken, sprinkle with sesame seeds and green onions, and serve with rice or whatever sides you'd like.