Combine the prawns, oil, paprika, oregano, cumin, coriander and lime zest in a large bowl. Season with salt and pepper. Set aside to develop the flavours.
To make the pickled cabbage, combine the cabbages, carrot, onion, vinegar, sugar, salt and chilli in a large bowl. Set aside for 15 minutes to develop the flavours.
- Combine the avocado, chilli, coriander and 1 tbs lime juice in a small bowl. Season with salt and pepper.
- Cook taco shells following packet directions.
- Heat a chargrill pan on high. Add prawns and cook for 2 minutes each side or until prawns curl and change colour.
- Drain cabbage of excess liquid. Divide prawns, cabbage and avocado among taco shells. Serve immediately.