
In a bowl, whisk cornstarch and water. Add soy sauce, rice vinegar, maple, hot chili sauce, orange juice and zest, and reserve.
Heat oil in a very large nonstick pan or wok over medium-high heat. Add tofu to pan and cook, browning on most sides, about 6-8 minutes. Cover the pan if there is too much sputtering. Add garlic and sliced bell pepper or blanched veggies and cook for half a minute. Add the sauce and cook until sauce begins to bubble(2-4 minutes). Then reduce heat, cover and cook for another 2 minutes. Serve with rice or other grains.