Preheat the oven to 180°
In a large bowl whisk together butter and sugar until they're very well combined and fluffy.
Filet 2 blood oranges (make sure that all the white parts of the orange cut off), chop the rosemary, then add everything to the sugar butter mix.
Bring in the eggs one by one and beat until you get a smooth batter. Now you can also add the flour and baking powder.
Butter a bundt cake mold and add the dough. Bake the cake for around 50 minutes.
While the cake is baking, prepare the blood orange syrup. In a saucepan bring the juice of 4 blood oranges to a boil, add the two table spoons of sugar, stir for about 3 minutes then reduce heat. Stir regularly until the syrup has reduced one third of its mass. Let cool until the cake is ready.
As soon as the cake is ready, let cool a few minutes until turning it on a wire rack.
Now poke a few holes into the warm cake and pour the blood orange syrup over the cake. Make sure to put a bowl under the wire rack and repeat at least twice. Let the cake cool completely.
In another bowl, gently beat the sour cream until creamy.
Add 2 table spoons blood orange juice and 100g of icing sugar. Mix, then add more icing sugar until the mixture gets real creamy.
Now cover the cake with the icing and cool in the fridge for 20 minutes.
Enjoy!!!!