Pour the oil into a large bowl, add the remaining 200g sugar and the eggs, and beat with a whisk until pale and fluffy. Fold in the apple and currant compote, along with the lemon zest, grated carrot, ginger, cinnamon and a pinch of salt. In a separate bowl, stir the baking powder into the flour, then fold this gently through the wet ingredients in the bowl to form a batter.