Curried lentil & turkey soup with kale

Ingredients

• 2 tbsp ghee -
• 1 red onion, finely chopped -
• 20g ginger, peeled and grated -
• 3 garlic cloves, finely chopped -
• small handful of coriander, leaves picked and stems finely chopped -
• 2 tsp ground cumin -
• ½ tsp ground cinnamon -
• 1 tsp ground turmeric -
• 1 tsp chilli flakes -
• 2 curry leaves -
• 1.2 litres chicken stock -
• 250g leftover roast turkey, shredded -
• 250g cooked puy lentils -
• 100g kale, tough stalks removed, leaves torn -
• 4 tbsp yogurt -
• chilli oil, for drizzling (optional) -
• 4 flatbreads -