1. Steam salted egg yolks until cooked, remove the hard granules inside the egg yolks then chop finely, set aside.
2. Heat wok, drizzle in a little oil, melt butter in low heat, then sauté minced garlic until fragrant, stir in half of the egg yolks, season with salt and sugar, transfer to a plate.
3. Rinse tiger prawns, remove heads and legs with scissors, cut open their back, shell first then flesh, devein and remove stomach from the head. Blot dry, dust a little corn starch and rub evenly onto the prawns’ flesh.
4. Heat wok, add oil, place prawns in, with the flesh side facing down, press gently with spatula so that the prawns do not curl up. Remove when half-cooked.
5. Spread a thin layer of buttered salted egg yolk on top of prawns’s flesh, scatter the remaining salted egg over.
6. Preheat oven at 180℃, place the prawns in, lower the temperature to 150℃ and bake for 5 mins, transfer to a plate and serve.