1-Begin by washing the zucchini and peeling: Begin by washing the zucchini and peeling the onion. Slice both into uniform pieces, aiming for thin ribbons or half-moons.
2-In a large wok or skillet, heat: In a large wok or skillet, heat about 2 tablespoons of oil over high heat until it shimmers, which usually takes about 2 minutes.
3-Add the sliced onions to the hot: Add the sliced onions to the hot pan and stir-fry for 2-3 minutes. Keep stirring frequently, allowing the onions to soften and caramelize slightly until they become translucent and golden.
4-Introduce the prepared zucchini to the pan: Introduce the prepared zucchini to the pan and stir-fry alongside the onions for another 5-7 minutes. Stir constantly to ensure even cooking, watching for the zucchini to become tender-crisp.
5-Pour in 2-3 tablespoons of soy sauce,: Pour in 2-3 tablespoons of soy sauce, stirring well to coat the vegetables evenly. Let the mixture sizzle for an additional 1-2 minutes as the sauce thickens slightly and coats the zucchini and onions in a glossy, savory glaze.
6-Once the zucchini is done to your: Once the zucchini is done to your liking, remove the pan from the heat. Sprinkle the stir-fry with toasted sesame seeds and serve immediately while hot.