Mango Chutney

Ingredients

• 2 cups white sugar
• 1 cup white vinegar
• 4-5 mangoes, peeled and cut into 3/4-inch pieces
• 1 medium onion, chopped
• ½ cup sultanas
• ¼ cup crystallized ginger, finely chopped
• 1 garlic clove, minced
• 1 tsp mustard seeds, whole
• ¼ tsp chilli flakes