01 -
Combine water, ketchup, brown sugar, vinegar, lemon juice, cornstarch, and salt in a small saucepan. Bring to a boil over medium heat, stirring continuously. Once thickened and glossy, remove from heat and let cool until serving.
02 -
In a large mixing bowl, whisk together cornstarch, all-purpose flour, sugar, baking powder, and salt. Gradually incorporate the cold water, whisking until a thick, smooth batter forms. Add a touch more flour or water if needed for proper coating consistency.
03 -
Pat chicken breast chunks dry with paper towels. Dip each piece into the batter, ensuring an even and complete coating. Allow excess batter to drip off before frying.
04 -
Heat neutral oil in a deep pan to 180°C. Working in batches of 8 to 10 pieces, gently lower battered chicken into the hot oil. Fry for 3 to 4 minutes per side until golden and crisp, turning as needed for even cooking. Avoid overcrowding the pan.
05 -
Transfer fried chicken balls to a wire rack or paper towel-lined tray to drain excess oil. Serve immediately with the warm sweet and sour sauce.