If the prawns have been frozen, defrost and dry thoroughly.Add parwns, garlic, ginger, spices, salt and pepper (to taste) and 2 tsp oil.Stir well to coat, marinade in fridge for 15 minutes.
Heat 1 tbsp oil over a high heat, add prawns and stir fry for 2 – 3 minutes ad set aside.
Add 1.5 tbsp oil, reduce heat, add onion and cook, stirring, until soft.Stir in tomatoes, cover and simmer for 5 minutes.
Return prawns to pan with yoghurt, warm through, stirring for about 1 minutes.
Season to taste and serve over cooked rice.Garnish with finely chopped coriander if desired.