Heat canola oil in a large wok or sauté pan over medium heat. Add garlic, ginger, and scallions, and cook until fragrant, about 1 minute.
Add water chestnuts, and continue to cook until they begin to soften, another 1–2 minutes.
Add vegetables, and toss until heated through, about 2–3 minutes (or up to 5 minutes for frozen vegetables).
Add rice, and continue to cook until hot, about 3–5 minutes.
Add soy sauce and sesame oil. Toss well, and serve.
TIP: This recipe tastes best when prepared using leftover cold rice.
source: National Heart Lung and Blood Institute