
This crispy Chinese lemon chicken delivers tender fried chicken with a light, crackly crust and a glossy sweet-tart lemon sauce. It has the nostalgic flavor of classic takeout, but the method is simple enough for a confident home cook.
In a medium bowl, whisk together the cornstarch, all-purpose flour, baking powder, and a pinch of salt for the batter. Refrigerate the dry mixture while you prepare the chicken so the batter stays cold and fries up lighter.
Place the chicken thigh fillets between sheets of plastic or in a freezer bag and pound them to an even 1/3-inch thickness. Season both sides with the kosher salt.
Spread the extra cornstarch on a plate and lightly coat each piece of chicken, shaking off any excess. Set aside while you heat the oil.
Pour 1000 to 1500 ml of vegetable or canola oil into a deep heavy pot so it is at least 1 1/2 inches deep. Heat the oil to 320°F (160°C).
Remove the dry batter mixture from the refrigerator and whisk in the cold soda water just until combined. A few small lumps are fine; do not overmix.
Dip 1 or 2 pieces of chicken in the batter, let the excess drip off, then carefully lower them into the oil. Fry for 3 minutes until pale golden, then transfer to a paper towel-lined tray. Repeat with the remaining chicken and let it rest for 20 minutes.
While the chicken rests, make the lemon sauce. In a small saucepan, whisk a spoonful of stock with the cornstarch until smooth, then add the remaining stock, lemon juice, sugar, garlic, ginger, and Chinese cooking wine. Bring to a simmer over medium heat and cook for about 3 minutes, whisking occasionally, until the sauce is glossy and lightly thickened.
Increase the oil temperature to 390°F (200°C). Fry the chicken again in batches for 3 minutes, turning halfway through, until deep golden brown and very crisp. Drain on a paper towel-lined tray.
Slice the chicken into thick strips and transfer to a serving plate. Spoon the warm lemon sauce over the top and garnish with sliced green onion and lemon slices, if desired. Serve immediately, preferably with steamed rice.
Keep the batter cold and avoid overmixing so the coating stays light and crisp. Fry in small batches to prevent the oil temperature from dropping. Leftovers can be refrigerated for up to 2 days, but the crust is best enjoyed fresh; reheat in the oven or air fryer to restore some crispness.
