Pat the chicken cubes dry with a paper towel. This helps them brown better in the pan. Sprinkle the chicken with black pepper and a tiny pinch of salt, though the soy sauce will provide most of the saltiness later.
In a small bowl, combine the orange juice, orange zest, soy sauce, honey, minced garlic, grated ginger, and cornstarch. Whisk vigorously until the cornstarch is completely dissolved and no lumps remain.
Heat the oil in a large skillet or wok over medium-high heat. Add the chicken pieces in a single layer. Cook for 5 to 7 minutes, turning occasionally, until the chicken is golden brown and cooked through. Work in batches if your pan is too small to avoid steaming the meat.
Pour the orange juice mixture over the cooked chicken in the skillet. Reduce the heat to medium. Stir constantly as the sauce begins to bubble and thicken. This should take about 2 to 3 minutes. The glaze should be glossy and coat the chicken evenly.
Remove the pan from the heat once the sauce reaches your desired thickness. Sprinkle with sesame seeds and chopped green onions for a fresh crunch and professional look.