Put your rice on to simmer while you prep the tempeh and sauce.
In a small bowl, whisk together the 2 T. cornstarch and 1/4 cup water. Set aside.
In a small saucepan, add the 1 cup water, soy sauce, rice wine, brown sugar, garlic, and ginger. Bring to a simmer and then stir in the cornstarch/water mixture. Sauce with thicken as you continue to stir for 1 more minute.
Turn off the heat and set aside to cool and thicken to gravy consistency.
Meanwhile, chop tempeh into triangles. Heat oil in a non-stick skillet and add the tempeh. Cook for 2-3 minutes on 1 side until golden and then flip each piece and cook on the second side for 1-2 minutes or until golden brown.
Add 1/4-1/3 cup of teriyaki sauce to tempeh in the skillet and toss to coat.
Assemble bowls by layering rice, chopped vegetables, and tempeh.