Sponsored.What better way to take advantage of winter’s oranges, grapefruits and mandarins than to make a bright and beautiful cake that really shows them off? As impressive as it looks, this upside down citrus yoghurt cake is surprisingly easy to make. In fact, the striking slices of citrus fruit do all the hard work! After arranging the slices at the bottom of the cake tin, they are covered in a syrup, then the cake batter, then baked all together. The fruit slices cook in the syrup resulting in a sweet and sticky marmalade-like topping.The cake batter uses NutriDay Double Cream...