Japanese Zucchini & Onion Stir-Fry
This Japanese-style zucchini and onion stir-fry is simple, fast, and full of flavor. Tender zucchini half-moons and sweet caramelized onions are tossed in a savory blend of teriyaki and soy sauce, finished with sesame seeds for a nutty touch. It’s the kind of side dish that works with almost anything, from grilled chicken to rice bowls, and it comes together in under 20 minutes.
The beauty of this recipe is in its balance. The zucchini stays slightly crisp, the onions turn soft and lightly sweet, and the sauce coats everything without overpowering the vegetables. It’s light, satisfying, and easy to customize.
Prep Time: 10 minutes
Cook Time: 8–10 minutes
Total Time: About 20 minutes
Servings: 3–4
Ingredients
2 medium zucchinis, sliced into half-moons
1 large onion (or 1 medium sweet onion), thinly sliced
2 tablespoons vegetable oil
2 tablespoons teriyaki sauce
1 tablespoon soy sauce
¼ to ½ teaspoon crushed red pepper flakes (to taste)
¼ teaspoon black pepper
1 teaspoon toasted sesame seeds
Instructions
Prepare the vegetables by slicing zucchini into even half-moons and onions into thin strips.
Heat a large skillet or wok over medium-high heat. Add vegetable oil.
Add the sliced onions and cook for 2–3 minutes, stirring frequently, until slightly softened.
Add the zucchini and stir-fry for another 3–4 minutes.
Keep the vegetables moving in the pan to prevent sticking and ensure even cooking.
Add teriyaki sauce and soy sauce, stirring to coat evenly.
Season with crushed red pepper flakes and black pepper.
Cook 1–2 more minutes until the zucchini is tender but still slightly crisp.
Taste and adjust seasoning if needed.
Sprinkle toasted sesame seeds over the top before serving. Serve immediately while hot.
Tips
Slice vegetables evenly for uniform cooking.
Use high heat to achieve a quick sear without overcooking.
Avoid overcrowding the pan to prevent steaming.
Pat zucchini dry if very watery before cooking.
Stir continuously for best texture.
Do not overcook zucchini; it should remain slightly firm.
Toast sesame seeds briefly in a dry pan for extra flavor.
Adjust red pepper flakes to control heat level.
Use a wok for better heat distribution if available.
Serve immediately for best texture and taste.
Variations
Add sliced mushrooms for extra umami flavor.
Stir in thinly sliced bell peppers for color.
Add minced garlic or grated ginger for deeper aroma.
Toss in cooked shrimp or chicken for protein.
Add a drizzle of sesame oil at the end for richness.
Sprinkle chopped green onions for freshness.
Add a splash of rice vinegar for brightness.
Mix in cooked noodles for a quick stir-fry meal.
Add tofu cubes for a vegetarian protein boost.
Top with a soft-boiled egg for a rice bowl option.
Q&A
Can I make this ahead of time?
It’s best served fresh, but leftovers can be refrigerated for up to 2 days.
How do I reheat it?
Reheat quickly in a hot skillet to avoid sogginess.
Can I reduce sodium?
Use low-sodium soy sauce and teriyaki.
Can I use yellow squash instead?
Yes, it works just as well.
Why is my zucchini watery?
It may have been overcooked or the pan overcrowded.
Can I make it spicier?
Add more red pepper flakes or a splash of chili oil.
What should I serve it with?
Steamed rice, grilled fish, or teriyaki chicken are great options.
Can I freeze it?
Freezing is not recommended due to texture changes.
Can I add sugar?
Teriyaki sauce already adds sweetness, but adjust to taste if needed.
Is this dish vegan?
Yes, as long as your teriyaki sauce is plant-based.
Nutrition
(Approximate per serving)
Calories: 120–150
Protein: 2–3g
Carbohydrates: 10–14g
Fat: 9–10g
Fiber: 2–3g
Sodium: Varies by sauce brand
This dish is low in calories and rich in vitamins from fresh vegetables. It’s light yet flavorful, making it an easy addition to balanced meals.
Conclusion
Japanese zucchini and onion stir-fry proves that simple ingredients can create bold flavor. With just a handful of pantry staples and fresh vegetables, you can have a quick, healthy dish on the table in minutes. It’s flexible, easy to adapt, and perfect as a side or light main. Once you try it fresh from the pan, you’ll likely keep it in regular rotation for busy days.