Using a medium bowl, whisk together all marinade ingredients.
Place tempeh into a 9X9 casserole bowl, pour marinade over tempeh cover and let tempeh marinate for 1 hour or overnight.
Place casserole dish into a preheated oven. Cook for 20 minutes. Turn tempeh over and cook an additional 20 minutes.
Notes
If you don't want to make homemade marinade, don't! Jar sauces maybe a bit salty and thick add a little water or vegan broth and your off to the races. Less effort but still delicious.