Stir fried chicken with black bean sauce

INGREDIENTS

• 2 tbsp sunflower oil
• 1 red onion
• 2 red peppers
• 1 garlic
• 2 red finger chillies
• 4 small chicken breasts
• 4 spring onions
• 1 tsp cornflour
• 6 tbsp blackbean sauce
• 2 tbsp dry sherry
• 75ml/3fl oz water
• 1 tbsp chopped fresh coriander