Heat the oil in a deep frying pan over a medium-high heat, and fry the aubergine with a pinch of salt for 5 mins until lightly golden. Stir in the chilli, ginger, turmeric and cumin, cook for another minute, then pour in the cherry tomatoes. Simmer for 10 mins until thickened.

Stir in the prawns and simmer for 2-4 mins until pink. Remove from the heat, stir in the coconut yogurt, lime juice and coriander, then serve with the warmed rotis.