Nici Wickes: Indian-spiced Tamarillo Chutney

Ingredients

• 1.5 kg tamarillos
• 2 apples – I use granny smith
• 2 onions, chopped
• 1 tbsp olive oil
• thumb-sized piece of ginger, grated
• 2 tbsps mustard seeds
• 2 tsps cumin seeds
• 3 tsps coriander
• 2 tsps turmeric
• 1 tsp chilli powder
• ¾ firmly-packed brown sugar
• 1 tsp salt
• 1 cup apple cider vinegar