Crumble the yeast into a bowl, add the ale and vinegar and stir to dissolve.

In a separate bowl, sift the flour, salt, sugar and saffron powder together. Make a well in the centre, pour in the yeast mixture and whisk well to combine, then strain through a fine-mesh sieve. Cover with a clean tea towel (dish towel) and set aside in a warm place for 10 minutes until the batter is aerated and increased in size.

Chipotle Mayo:

Whisk the aioli, chipotle in adobo sauce and lime juice together in a medium bowl. Strain through a fine-mesh sieve. Season with salt and refrigerate until required.

Combine the cabbage, fennel and radish in a medium bowl, cover with damp paper towel and refrigerate until required. Keep the onion and parsley in separate bowls until ready to serve.

Half-fill a large heavy-based saucepan with oil, set over medium heat and heat the oil to 180°C (350°F).

Dredge the fish in flour, coat in the batter and fry in batches, for 2–3 minutes, until golden. Remove using a slotted spoon or tongs and place on paper towel to drain.

Heat a medium non-stick frying pan over high heat. Lightly spray with oil and briefly fry the tortillas to warm them. Stack the tortillas, wrap them in a warm damp tea towel (dish towel) and set aside to keep warm.

Combine the slaw ingredients, add the lime dressing and toss. Season with salt.

Re-fry the fish for 1–2 minutes, until crisp, golden and cooked through.

To serve, place the tortillas onto serving plates, drizzle with the chipotle mayo and adobo sauce and top with a little of the slaw and a piece of crispy fish. Drizzle with a little more of the sauces. Serve with napkins, ice cold beer or chilled riesling.