Pineapple chutney - Good Food Middle East

Ingredients

• 2 tbsp sunflower oil
• 3 red onions, finely chopped
• 1 tbsp yellow mustard seeds
• 1 tbsp black onion seeds (kalonji or nigella)
• 1 tsp turmeric
• 2 pineapples peeled, cored and chopped into small chunks
• 1 red chilli, deseeded and finely chopped
• thumb-sized piece ginger, finely chopped
• 250g soft light brown sugar
• 175ml cider vinegar