Baja-style deep-fried mackerel tacos

Method

1. To make the beer batter, sift the flour, baking powder and ½ tsp salt into a bowl. Gradually whisk in the beer to make a smooth batter. Cover and set aside for 30 minutes.
2. Meanwhile, for the salsa, heat the oil and garlic in a shallow pan and, as soon as the garlic starts to sizzle, add the onion. Fry gently until soft but not browned. Add the chillies, fry for a couple more minutes, then add the tomatoes. Simmer for 10 minutes until the sauce has reduced and thickened. Season and keep warm.
3. Mix the mayo with the yogurt or soured cream and set aside. Preheat the oven to 120°C/fan100°C/gas ½.
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4. Heat the oil in a large saucepan to 190°C (when a small piece of bread turns golden within 40 seconds). Meanwhile, wrap the tortillas in foil and warm through in the oven.
5. Season the fillets, then cut each crossways into 2.5cm wide strips. Using tongs, dunk a few pieces in the batter. One at a time, drop 4 pieces into the hot oil, suspending each one in the oil for a few seconds before you let go, so it doesn’t sink immediately and stick to the bottom. Deep-fry for 3 minutes until crisp and golden. Remove with a slotted spoon and drain briefly on kitchen paper. Add 4 more pieces to the oil, then assemble the first taco.
6. Spread some mayo mixture down the centre of a warmed tortilla and scatter over a little cabbage. Place deep-fried fish down the centre, spoon over some salsa, then squeeze over a wedge of lime. Top with coriander, roll up and serve. Repeat for each of the tacos.