Hot & Sour Chicken Soup

WHAT YOU'LL NEED

• 1 medium red onion, peeled and finely sliced
• 1 bird's eye chilli, very finely chopped
• 2 tablespoons vegetable oil
• 1 Knorr Chicken Stock Cube
• 4 tablespoons rice vinegar
• 2 tablespoons reduced-salt soy sauce
• 50 g rice vermicelli
• 200 g cooked chicken breast, cut into 1 cm slices
• 6 spring onions, washed and finely sliced