Drain and rinse the young green jackfruit, then use a fork to shred the pieces until they resemble pulled meat.
Finely crumble the tempeh into a bowl and set aside with the shredded jackfruit.
Heat the olive oil in a large skillet over medium heat and add the jackfruit and tempeh, sautéing until they begin to turn golden brown.
Stir in the black beans, nutritional yeast, chili powder, cumin, garlic powder, sea salt, and black pepper.
Add a splash of water to the skillet to help the spices and nutritional yeast coat the mixture, simmering for 3-5 minutes.
In a small bowl, mash the avocado with the lime juice until smooth and creamy.
Warm the corn tortillas in a dry pan or over an open flame until pliable.
Divide the jackfruit and tempeh filling between the tortillas and top with a dollop of the avocado crema.