Crispy chilli beef

INGREDIENTS

• 350g thin-cut minute steak , very thinly sliced into strips
• 3 tbsp cornflour
• 2 tsp Chinese five-spice powder
• 100ml vegetable oil
• 1 red pepper , thinly sliced
• 1 red chilli , thinly sliced
• 4 spring onions , sliced, green and white parts separated
• 2 garlic cloves , crushed
• thumb-sized piece ginger , cut into matchsticks
• 4 tbsp rice wine vinegar or white wine vinegar
• 1 tbsp soy sauce
• 2 tbsp sweet chilli sauce
• 2 tbsp tomato ketchup
• cooked noodles , to serve (optional)
• prawn crackers, to serve (optional)