Spiced Pineapple Chutney

Ingredients

• 2 tbsp olive oil
• 3 red onions, finely chopped
• 1 tbsp mustard seeds
• 1 tsp turmeric
• ¼ tsp ground coriander
• 6 cups fresh pineapple pieces
• 1 red birdseye chilli, deseeded and finely chopped
• 2 ½ cm piece of ginger, peeled and grated
• 250 g light brown sugar
• 175 mL apple cider vinegar
• 1 tsp salt