In a medium sized saucepan, warm the olive oil and butter, next add the diced apples, onions, grated ginger, mixed spice, mustard seeds, cloves, salt and pepper to taste. Cook on a medium heat stirring occasionally for a few minutes until the onions and apples are slightly browned and caramelized.
Add the brown sugar and cook for another minute on medium heat, stirring occasionally. Finally, add apple cider vinegar and chilli flakes; simmer until completely dry on low heat for about 10-15 minutes. Finish with raisins. The longer it ages, the more flavour the dish has.