Grilled fish kebabs

Ingredients

• 1 kilogram white fish fillets
• 2 medium zucchini (240g), cut into chunks
• 1 medium red capsicum (200g), cut into chunks
• 1 medium red onion (170g), cut into wedges
• 8 bamboo skewers (see notes)
• 1 cup (250g) plain yoghurt
• 2 tablespoons lemon juice
• 3 cloves garlic, crushed
• 2 teaspoons ground cumin
• 2 teaspoons ground coriander
• 1 teaspoon sweet paprika
• 1/2 cup fresh coriander leaves, loosely packed