Piccalilli chicken

Ingredients

• 1 onion, halved
• 1 head cauliflower, florets removed
• Spray oil
• 3 teaspoons cornstarch
• 3 teaspoons wholegrain mustard
• 1 green chilli (optional)
• 1 teaspoon mustard powder
• 1 teaspoon turmeric
• 1 teaspoon coriander seeds
• 100ml sherry vinegar
• 3 teaspoons maple/agave syrup
• 2 bay leaves
• 6 chicken mini fillets or 2 medium chicken breasts sliced into 6 strips
• 180g tenderstem broccoli