Heat the oil in a large pan over a medium heat and add the chopped red onion. Sizzle for 2 minutes, then add the pork. Cook until browned, then stir in the cumin, ground coriander and smoked paprika.
Stir in the passata and drained black beans, put a lid on your pan and simmer for 20 minutes.
Stir in your chopped coriander and season to taste.
To serve, arrange the avocado, lettuce, cheese, soured cream and pork on the table with the taco shells and let everyone help themselves!