Marinate the prawns with a little turmeric powder and salt.
Heat oil in a pan, sauté the prawns over high heat for 3-4 minutes. Take them out in a bowl. Keep aside.
Into the same oil, throw in the mustard seeds and curry leaves. Allow them to splutter.
Add the sliced onions, fry till lightly browned.
Add the ginger and garlic, stir fry for a further 2 minutes.
Add the green and red bell pepper, geeen chillies and tomatoes. Sauté for 5-7 minutes.
Add the soy sauce, red chilli flakes, turmeric powder, half the curry powder, red chilli powder and the sautéed prawns .
Season with salt, cook over high heat for 5-6 minutes .
Pour in the coconut milk, cover and cook over medium low heat for another 5 minutes.
Add a generous sprinkle of the julienned ginger, spring onions and remaining curry powder. Give it all a hearty mix. Switch off the flame. Serve hot.