In a frying pan, fry the onions in oil for 4 minutes until softened. Next add the garlic, chilli pastes and smoked paprika, ground cumin, cinnamon and oregano and continue to fry for a further 1-2 minutes to fully coat the onions and help release the spice flavours.
Pour all the contents of the tinned cherry tomatoes in the pan, stir to incorporate and reduce the sauce for 10 minutes. Season with salt and pepper to taste.
Pat the cod fillets dry with some kitchen paper, season with salt and place on top of the sauce. Place a lid over the pan and steam the fish for 6 minutes.
Remove the lid and take out the cooked cod fillets and set aside. Stir the sauce. If it is too wet, reduce to a paste-like consistency (3-5 minutes). Take off the heat to cool.
Preheat the oven to 200℃/392°F and prepare another large frying pan for heating the tortillas in hot vegetable or olive oil. Cooking in batches fry each tortilla for 1 minute on each side.
Flake the cod into large meaty pieces and stir into the cooled sauce along with the medley of seafood (cooked squid, mussels and prawns). Add a squeeze of lime and a handful of chopped coriander (cilantro).
To build the quesadillas, take four fried tortillas and liberally sprinkle over a layer of grated cheese on each one. Spoon over equal amounts of the fish filling on each tortilla and sprinkle over a final layer of cheese on top. Place the remaining tortillas on top creating your “sandwich” quesadilla.
Place the quesadillas on an oven tray and bake for 6-8 minutes at 200℃/392°F until the cheese has melted. Serve whilst hot with garnishes and side dips.