Wash prawn and remove the black vein from prawn with tip of knife.
Wash thoroughly with water ,turmeric and keep it aside .
Take wide pan ,add sesame oil ,once oil turn hot add finely chopped garlic saute for few second then add ginger and saute for few more minute.
Now add onion and saute till golden color then add tomato with required amount of salt and saute for few more minute.
Then add sriracha sauce,soy sauce ,brown sugar mix nicely with onion tomato and cook on medium flame for 2 to 3 minute make sure not to burn the sauce.
Now add the cleaned prawn - toss along with sauce nicely and cook for 3 to 4 minute. Once prawn is cooked along with sauce syrup. Switch off the flame and serve with fried rice or noodles or white rice too!!