Tempeh Marinade:
Cut the tempeh in bite size cubes.
Peel garlic and crush slightly.
Place tempeh and garlic in a saucepan with the water, tamari and ginger. Bring to a boil, reduce heat and simmer for 10 minutes. Drain, reserve the cooking liquid with the garlic. Discard the ginger.
In a skillet, heat the oil and saute the tempeh over high heat until lightly browned. Set aside in a serving bowl.
Sweet and Sour Sauce:
In a medium saucepan, combine 1/2 cup of the apple juice with the tempeh broth, vinegars, syrup and mustard. Place over high heat.
In a small bowl, dissolve the kudzu in the remaining apple juice. Add to the saucepan, stirring until the mixture has thickened and comes to a boil, about 2 to 3 minutes.
Add the orange rind and cook for 1 minute more. Pour over the tempeh immediately and mix.
Serve hot over grain.