Baingan ka Bharta

Ingredients

• 1 tbsp mustard oil + more for brushing
• 800g or 2 large aubergines or eggplants
• 200g or 2 medium onions
• 200g or 2-3 tomatoes
• 20g ginger
• 18g or 4 cloves garlic
• 2 green chillies
• 1/2 tsp turmeric powder
• 1/2 tsp kashmiri red chilli powder
• 1.5 tsp salt or to taste
• 12-15 coriander sprigs