Heat oil in a large-pot over moderate heat, then add onion, together with a pinch of pepper and salt and cook, stirring frequently for 5 minutes.
Preheat oven to 400°. Then add cumin, chiles in adobo, chili powder, black beans, garlic powder, carrot juice, quinoa, ½ cup water and stir to blend.
Cook for 3 minutes, stirring regularly. Then add more water if needed. Now, you this should to have a similar feel and consistency as ordinary taco meat.
Place crispy taco shells in a 9×13" pan. Divide taco-meat evenly between the taco shells. Divide cheese evenly between the taco shells.
Bake for 4-6 minutes. Top with all of your favorites like a lettuce, sour cream, jalapeno, queso fresco, cilantro and guacamole.