01 - Pat shrimp completely dry with paper towels. Toss with 1/2 teaspoon salt, white pepper, and black pepper. Let marinate for 5 minutes.
02 - Toss seasoned shrimp in cornstarch until lightly coated. Shake off excess powder to prevent clumping during frying.
03 - Heat vegetable oil in deep skillet or wok 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 most oil, leaving 1 tablespoon in pan. Add garlic and chili. Stir-fry 30 seconds until fragrant but not browned.
05 - Return shrimp to pan. Add scallions, Sichuan peppercorns, and remaining salt. Toss over high heat for 1 minute until thoroughly combined.
06 - Plate immediately with lemon wedges on the side.