Wash, remove shell and de-vein prawns retaining the tip of the tail. Pat dry prawns thoroughly with an absorbent paper. Mix garlic paste, oyster sauce, lemon juice, soy sauce, white pepper powder, MSG and salt.
Apply this mixture liberally on the prawns and leave aside to marinate for two hours, preferably in a refrigerator. Mix refined flour, cornflour, baking powder, three-fourth cup of oil, salt and three-fourth cup of water.
Whisk thoroughly to make a batter of pouring consistency and set aside for twenty minutes. Heat sufficient oil in a wok, dip marinated prawns in the batter by holding the tail and deep-fry on medium heat, turning frequently, for two to three minutes or until crisp and golden brown in colour.
Drain on absorbent paper and serve hot with a sauce of your choice.