Have a fiesta with these tacos!
Throw onion, lime juice, pineapple + juice, liquid smoke, soy sauce, chili powder, and cumin into blender. Blend until pretty smooth. Chunks are okay. Set aside.
Cut tempeh up into desired pieces, strips, chunks, whatever. Set aside.
Shred sweet potatoes using food processor or grater.
Cook tempeh in oiled pan for 5-7 minutes on each side. Add in sweet potato. Drizzle more oil if needed. Cook for 4 minutes.
Add in blended mixture, mix all items thoroughly until mixed well. Serve on tortillas with desired toppings.