01 - Pat shrimp completely dry using paper towels. In a mixing bowl, combine shrimp with 1/2 tsp sea salt, white pepper, and black pepper. Toss thoroughly to coat evenly. Let stand at room temperature for 5 minutes to allow flavors to penetrate.
02 - Add cornstarch to the seasoned shrimp. Toss until each shrimp is lightly and evenly coated. Shake off any excess cornstarch to prevent clumping during frying.
03 - Heat vegetable oil in a wok or deep skillet over medium-high heat to 350°F. Working in batches to avoid overcrowding, fry shrimp for 2–3 minutes until golden brown and crispy. Remove using a slotted spoon and drain on paper towels. Repeat until all shrimp are fried.
04 - Carefully pour off all but 1 tablespoon of oil from the pan. Return to medium-high heat. Add chopped garlic and sliced chili. Stir-fry for 30 seconds until fragrant and lightly golden, taking care not to burn the garlic.
05 - Return fried shrimp to the pan. Add sliced scallions, Sichuan peppercorns, and remaining 1/2 tsp sea salt. Toss vigorously over high heat for 1 minute until all ingredients are well combined and heated through.
06 - Transfer immediately to a serving platter. Accompany with fresh lemon wedges for squeezing. Serve hot while shrimp remain crispy.