1 .Cut the prawns from back and devein. Rinse and pat-dry, season it with marinade, mix well, and marinate prawns in refrigerator overnight, set aside.
2.Heat 1 tbsp cooking oil in wok to sauté ginger over low heat, add garlic, chilies and butter, stir-fry briskly until fragrant and the butter is melt.
3. Add marinated prawns and dark soy sauce, toss well, cover with lid. Simmer it over medium heat for 30 seconds, reduce to low heat. Let it simmer until the prawns are cooked through, and the sauce is almost absorbed or dry. Remove from heat, serve at once.