Coronation chicken and mango piccalilli sandwich recipe

Ingredients

• 300ml apple cider vinegar
• 1 tbsp flaky sea salt
• 1 tbsp coriander seeds
• 1 tsp cumin seeds
• 2 tsp mustard seeds
• 1 tsp whole black peppercorns
• 2 bay leaves
• 1 small cauliflower, approximately 400g, cut into small florets
• 10 radishes, halved
• 10 small shallots, peeled and halved
• 2 red chillies, sliced
• 1 mango, peeled and cut into 1cm dice
• 125g light brown sugar
• 1 tbsp mild curry powder
• ½ tbsp mustard powder
• 1 tbsp ground turmeric
• 1 tbsp cornflour
• 75g light mayonnaise
• ½ tsp curry powder
• juice of ½ lemon
• 30g sultanas
• 200g cooked chicken breast, shredded
• soft butter, for spreading
• 4 slices rustic white loaf
• handful baby leaf spinach