Prep Your Vegetables:
Slice the zucchini, mushrooms, and onion into uniform pieces for even cooking.
If using optional vegetables like bell peppers or snap peas, slice them similarly.
Cook the Vegetables:
Heat a large skillet or wok over medium-high heat. Add the unsalted butter and let it melt.
Add the minced garlic to the pan and sauté for 30 seconds until fragrant.
Toss in the zucchini and onion, cooking for about 5 minutes, stirring occasionally to prevent burning.
Add the mushrooms (and any optional veggies) and cook for another 5 minutes until everything is tender and slightly caramelized.
Season and Finish:
Add the soy sauce and sesame oil to the pan. Stir well to coat the vegetables in the sauce and allow it to absorb into the veggies for about 2 minutes.
Garnish with sesame seeds before serving for a nice crunch and extra flavor.
Serve:
Serve the hibachi vegetables immediately as a side dish or over rice for a complete meal.