Prep the green beans: Trim the ends and rinse.
Blanch (optional but recommended):
Boil salted water, add green beans for 2–3 minutes until bright green and slightly tender.
Immediately transfer to ice water to stop cooking. Drain and dry well.
Mix the sauce: In a small bowl whisk together soy sauce, mirin (or alternative), honey/maple, and brown sugar if using.
Heat the pan: Warm a large skillet over medium-high heat with neutral oil.
Saute aromatics: Add garlic and ginger; saute 20–30 seconds until fragrant.
Cook the green beans: Add blanched beans and toss, letting them blister slightly for 2–3 minutes.
Add the glaze: Pour the sauce over beans. Simmer 1–2 minutes.
Thicken (optional): Stir the cornstarch slurry and drizzle it in while stirring until the sauce becomes glossy and coats the beans.
Finish: Remove from heat; drizzle sesame oil, add sesame seeds and black pepper. Toss to combine.
Serve warm as a side or part of a meal.