3 unripe mangoes (supermarket mangoes are fine), about 200g/7oz each, peeled and cut into small cubes
1 tsp dried chilli flakes
50驳/1戮辞锄 demerara sugar
1 tsp fennel seeds, crushed
1 tsp ground ginger
陆 tsp nigella seeds
陆 tsp salt
2 tbsp rapeseed or sunflower oil
4 tbsp white pickling vinegar