Slice the tempeh into small strips. Combine the 1/2 cup balsamic vinegar and 1/4 cup teriyaki or soy sauce in a small bowl, and add the tempeh to marinate for at least an hour.
When the tempeh is almost finished marinating, heat the grill to high. Combine the 1/4 cup balsamic vinegar and 1/4 cup pomegranate molasses in a small saucepan over low heat. Stir often until the mixture is warm.
When the tempeh has absorbed the marinade, grill the tempeh on each side, approximately 2-3 minutes per side.
Serve the tempeh hot, and drizzle with the warm sauce. This is great paired up with sauteed greens!!