Marinate prawns with egg white, cornstarch, salt, and white pepper for 15 minutes.
Heat oil for deep-frying in a wok to 170-180°C (340-350°F). Deep-fry marinated prawns in batches for 2-3 minutes until golden and cooked through. Remove and drain excess oil.
In a clean pan, melt butter over medium heat. Add minced garlic, sliced chili (if using), and curry leaves. Sauté until fragrant, about 1 minute.
Add the mashed salted duck egg yolks to the pan. Cook, stirring constantly, until the yolks become frothy and a 'sandy' texture forms, about 2-3 minutes.
Stir in the sugar. Then add the deep-fried prawns and toss quickly to coat them evenly with the golden sand sauce. Serve immediately.
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