Apple slaw: combine the cabbage, apple, spring onion and coriander in a mixing bowl. Mix the mayonnaise and lime juice in a small glass jar and shake well. Season with salt and pepper, then pour the dressing over the apple slaw and toss well. Refrigerate until ready to eat.
Fish: slice the fish across the fillet into pieces about 1.5cm (½in) thick. Combine the flour and ground cumin in a dish, season with salt and pepper and toss in the fish to coat well.
Salsa: combine the avocado, chopped chilli and lime juice. Set aside.
To serve: warm the tortillas in a lightly oiled pan or barbecue plate, or char over a flame. Fill with apple slaw, fried fish and a dollop of chilli avocado salsa. Serve with extra coriander sprigs, if you have them, and lime wedges.