Tandoori chicken

Name: Tandoori chicken
Prep time: 20 min
Cook time: 45 min
Total time: 1 h 5 min
Cuisine: Asian, Indian
Ingredients: 1 tbsp coriander seeds; 1 ½ tbsp cumin seeds; 6 cardamom pods (black); 10 whole cloves; 2 tbsp Kashmiri chilli powder; 1 tbsp ground turmeric; 2 tbsp ground cinnamon; 1 tbsp salt; 60 g brown sugar; 120 g tomato paste; 120 g garlic paste (see Tips); 80 g ginger paste (see Tips); 200 g olive oil, plus extra for preserving; water, for soaking; oil, for greasing; 800 g chicken thigh fillets, cut into pieces (3 cm); ½ lemon, juice only; 1 tsp salt; 1 pinch ground black pepper; 200 g natural yoghurt; 30 g ghee (see Tips); fresh mint leaves, for garnishing; lemon wedges, to serve