Korean fried chicken burgers

Name: Korean fried chicken burgers
Prep time: 30 min
Cook time: 20 min
Total time: 50 min
Cuisine: Korean
Ingredients: 4 skinless boneless chicken thighs fillets; large piece of ginger finely grated; 100g cornflour; vegetable oil for frying; 6 tbsp dark brown sugar; 2 tbsp Korean chilli paste (gochujang) – see tip; 2 tbsp soy sauce; 2 large garlic cloves crushed; small piece ginger grated; 2 tsp sesame oil; ½ white cabbage finely sliced; 1 mooli shredded into thin strips; 4 spring onions finely sliced; 1 tsp golden caster sugar; 1 garlic clove crushed; 2 tbsp mayonnaise; pinch of hot chilli powder; 1 Little Gem lettuce divided into leaves; 4 brioche or sesame seed burger buns split and lightly toasted