Steam the tempeh to remove the bitterness. Place the tempeh log in a small or medium pot with ¾ inch of water. Put the lid on the pot and steam over medium-low heat for about 10 minutes.
Remove the tempeh from the pot and let cool for 1 minute. Wrap the tempeh in a paper towel and lightly press to remove any excess water. Then slice the tempeh into strips
While the tempeh is marinating, preheat the air fryer. Place the marinated tempeh in even rows in the air fryer. Cook for 15 to 17 minutes, stopping halfway to flip the tempeh strips.