BBQ Chicken Tandoori

• 500 g chicken thigh fillets
• 1 cup plain Greek yoghurt
• 2 tbsp tandoori paste
• 1 large eggplant, slice vertically, approx ½ cm thick
• 2 red capsicum (red pepper), deseeded and chopped
• 2 bunch asparagus, tough ends (approx 1inch) removed
• 1 cup tzatziki