Korean-style sticky chilli chicken

Name: Korean-style sticky chilli chicken
Prep time: 5 min
Cook time: 25 min
Total time: 30 min
Cuisine: Asian, Korean
Ingredients: 6 skinless chicken thigh fillets, excess fat trimmed away, each cut into 6 pieces; 3 tablespoons cornflour; low-calorie cooking spray; 2 spring onions, slices, to serve; 2 garlic cloves, crushed; 2cm (3/4 inch) piece of fresh root ginger, peeled and finely grated; 2 tablespoons dark soy sauce; 2 tablespoons honey; 1 tablespoon rice wine; 1 tablespoon gochujang paste (see note above for more information); 1 tablespoon apple cider vinegar; 1 tablespoon soft dark brown sugar; 1 teaspoon toasted sesame oil