Coat the Chicken: In a large bowl or zip-top bag, toss the chicken pieces with cornstarch until they are evenly and lightly coated.
The Sauce: In a small jar or bowl, whisk together the soy sauce, honey, and rice vinegar. Set aside.
High-Heat Sear: Heat 2 tablespoons of oil in a wok or large skillet over high heat. Add the chicken (in batches if necessary) and sauté for 6–8 minutes until golden-brown and cooked through. Remove the chicken from the pan and set aside.
Stir-Fry Veggies: In the same pan, add a splash more oil if needed. Add the bell peppers and pineapple. Stir-fry for 3–4 minutes until the peppers are crisp-tender and the pineapple edges are slightly caramelized.
Aromatics: Add the minced ginger and garlic. Stir for just 30 seconds until the aroma is fragrant but the garlic hasn't browned.
The Glaze: Return the cooked chicken to the pan. Pour the sauce mixture over everything.
The Finish: Toss continuously for 1–2 minutes. The sauce will bubble and transform into a thick, glossy glaze that clings to every piece.
Serve: Remove from heat immediately. Serve over a steaming bed of jasmine rice and garnish with sesame seeds.