01 - Pat the shrimp completely dry with paper towels. Toss with 1/2 teaspoon salt, white pepper, and black pepper in a bowl. Let marinate for 5 minutes.
02 - Toss seasoned shrimp in cornstarch until evenly coated. Shake off excess starch to prevent clumping during frying.
03 - Heat vegetable oil in a wok or deep skillet over medium-high heat. Fry shrimp in batches for 2-3 minutes until golden and crisp. Remove with slotted spoon and drain on paper towels.
04 - Pour off all but 1 tablespoon of oil. Add garlic and chili, stir-frying for 30 seconds until fragrant but not browned.
05 - Return shrimp to pan with scallions, Sichuan peppercorns, and remaining salt. Toss over high heat for 1 minute until thoroughly combined.
06 - Plate immediately and serve with lemon wedges on the side.