Preheat your oven to 180oC (fan).
Line your traybake tin/loaf tin/whatever you're using with baking paper.
Whisk together the butter and sugar until lighter in colour and creamy.>You’re looking for the mix to be paler, smooth & creamy! I use an electric whisk for 2 mins. Crack all the eggs into a separate bowl & beat together.
Add the beaten eggs, zest and flour to the butter/sugar and whisk together until JUST combined (20-30seconds).>Don’t over whisk, otherwise you’ll lose the air bubbles & they won’t be quite so fluffy! Add the shot of Aperol and whisk again for 5 seconds.
Pour the mix into your tin. It should be about 2/3 full to give it enough room to expand when it bakes.
Bake for approx 30 mins>You’re looking for them to be firm on top but springy to touch and a knife/skewer poked into the middle of the cake should come out relatively clean! Add the "drizzle" ingredients into a pan and warm on a low heat until the sugar dissolves.
Poke holes all over the top of the cake with a skewer (I went for about 20 holes!). Pour the drizzle over the top of the cake.
Leave to cool slightly for 5 mins in the tin & then remove and transfer to a cooling rack to cool completely.
Once cool, mix the icing powder with 10ml of water. It should be thick enough to coat the back of a spoon.
Pour over the cake and let some run down the sides. Add some orange segments for decoration if you'd like to. Enjoy!!