While the tofu is cooking, prepare the orange sauce.
In a large sauce pan, combine the water, orange juice, lime juice, lemon juice, vinegar, orange zest, brown sugar, ginger, garlic, and soy sauce. Stir to combine. Place the pan over medium heat and bring to a boil. Reduce the heat to medium-low and let the sauce reduce by 1/3.
In a small bowl, prepare the slurry by combining the cornstarch and water until smooth. Pour the mixture into the sauce and whisk until the sauce thickens. Take the sauce off the heat.
Once tofu is completely browned and a bit crispy on the sides, pour orange sauce over the tofu. Mix in the steamed vegetables.
Serve over brown rice.
Notes
Adapted from EvilShenanigans.com
http://www.evilshenanigans.com/2010/01/orange-chicken-with-fried-rice/