Cut tempeh into triangles or squares and steam in a steamer basket for 10 minutes.
Add all ingredients for the marinade into a bowl and whisk together.
Place tempeh into a dish and pour marinade over. Marinate for at least 20 mins (save the rest of the marinade).
Place oil in a pan and sear the tempeh for 3-5 minutes on each side until crispy. Add the rest of the marinade to the tempeh and cook until it has evaporated.
Add all of the dressing ingredients to a large bowl and whisk until combined.
Add slaw ingredients to the dressing and mix until coated.