Prepare vegetables. Heat oil over medium high heat in a large skillet. I prefer a seasoned oil, such as Tourangelle Stir-Fry Oil, which is infused with sesame, garlic and ginger. Try different types of flavored oils.
Start with the carrots, and stir-fry them about 3 minutes to soften them up. Add in onions and stir-fry 2 more minutes.
Add in zucchini and continue to stir fry 2-3 minutes until zucchini is done to your liking.
Season with kosher salt and fresh ground black pepper to taste. Serve immediately.