Spicy General Tso's Chicken

Name: Spicy General Tso's Chicken
Prep time: 15 min
Cook time: 25 min
Total time: 40 min
Cuisine: Asian, Chinese
Ingredients: ½ cup plain flour (all-purpose flour); ½ cup corn flour (cornstarch); 500g (1.1 lb) chicken breast, diced; vegetable oil for frying, plus 1 tbsp extra; 2 garlic cloves, finely chopped; 4cm piece ginger, finely julienned; 6 dried chillies, cut into 3cm pieces, seeds removed; thinly sliced spring onions (scallions) to serve; 1/3 cup chicken stock; 2 tbsp light soy sauce; 1 tbsp Chinkiang vinegar; 2 tbsp Chinese Shaoxing wine; 2 tbsp caster sugar; 1 tsp cornflour; 1 egg white, lightly whisked; 1 tbsp light soy sauce; 1 tbsp vodka (optional); 1 tsp dark soy sauce; 1 tsp baking soda