Crumble the tempeh in a medium sized mixing bowl and add the beans and spices. Mix well, adding water as needed if the mixture is dry (about 1/4 cup).
Heat the olive oil in a large pan and add in the garlic. Saute for 1 minute, until fragrant.
Add in the tempeh/black bean mixture, turn the heat down to medium-low and cook for 10 minutes, adding water if needed for texture (about 1/4 cup as needed).
Taste and season to taste. Serve the tempeh tacos with chopped tomato, green cabbage, salsa and any other topping you enjoy over hard or soft shells of your choice.