Pat dry prawns, season with salt and white pepper, then lightly coat with cornstarch.
Heat frying oil in a wok or deep pot to 170°C. Deep-fry pumpkin cubes until tender and golden brown, about 3-4 minutes. Remove and drain on paper towels.
Using the same oil, deep-fry the coated prawns until golden and crispy, about 2-3 minutes. Remove and drain on paper towels.
In a clean wok, melt butter with cooking oil over medium heat. Add minced garlic, sliced chili (if using), and curry leaves (if using). Sauté until fragrant.
Add mashed salted egg yolks to the wok. Stir continuously until the mixture becomes foamy and fragrant.
Return the fried prawns and pumpkin to the wok. Toss quickly to ensure they are evenly coated with the salted egg yolk sauce. Serve immediately.
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