Mango and chilli fish tacos

Name: Mango and chilli fish tacos
Prep time: 4 h
Cook time: 40 min
Total time: 4 h 40 min
Ingredients: 1 lb (450 g) white fish, skinned, pin-boned and cut into 1-inch (2-3cm) chunks; 1 garlic clove, peeled and crushed; 1 egg; 1½ tsp (7.5 ml) cumin seeds, toasted and finely crushed; 4 limes, zest finely grated, then cut into halves, to serve; Salt; 1 cup (20 g) coriander leaves, finely chopped; ½ cup (125 g) Greek-style yogurt; ½ red onion, peeled and very finely sliced (use a mandolin, ideally); ⅓ mango, peeled and cut into julienne strips; 1 red chile, deseeded and cut into julienne strips; 3 tbsp (45 ml) vegetable oil; 12 corn tortillas (6-inch/15cm-wide ones)