01 - Pat squid dry with paper towels. Place squid rings in a bowl and toss with soy sauce, garlic powder, white pepper, and salt. Let marinate for 10 minutes.
02 - In a mixing bowl, combine flour, cornstarch, and baking powder. In a separate bowl, beat the egg with cold sparkling water. Pour wet ingredients into dry and whisk gently until just combined; batter should remain slightly lumpy.
03 - Heat vegetable oil in a deep fryer or heavy saucepan to 350°F (180°C).
04 - Dip marinated squid rings into the batter, allowing excess to drip off.
05 - Carefully fry squid in batches for 2 to 3 minutes until golden brown and crispy. Avoid overcrowding the pan.
06 - Remove fried squid using a slotted spoon and drain on paper towels. Serve immediately with lemon wedges and choice of dipping sauce.