1Heat the vegetable oil in a pan over medium heat.
Add the finely chopped onion and sauté until golden brown.
Add the minced garlic and grated ginger, and sauté for another minute.
Stir in the ground cumin, turmeric, and red chili powder, and cook for 30 seconds until fragrant.
Add the chopped tomatoes and cook until they soften and release their juices.
Stir in the tamarind paste and coconut milk, and bring the mixture to a gentle simmer.
Add the prawns to the pan and cook for 5-7 minutes, or until they are cooked through and opaque.
Season with salt to taste.
Garnish with fresh coriander leaves before serving.
Serve hot with steamed rice or bread of your choice.