Preheat oven to 360º F/ 180º C. Line a 7-8 inch/ 18-21 cm cake pan with a sheet of parchment paper. Grease very well the pan inside.
In a large mixing bowl using an electric mixer beat together eggs and sugar for about 5 minutes at the highest speed, until fluffy, thick and pale.
Gradually add the olive oil, vanilla, orange zest and sour cream. Beat at a lower speed until absorbed.
In a bowl mix together the flour, baking powder, salt and ground cardamom.
Using a rubber spatula, gradually add the dry ingredients to the egg mixture. Alternate with the orange juice. Make sure no flour lumps remain.
Transfer the batter to the prepared pan. Bake for about 40 minutes or until a toothpick/ wooden skewer inserted in the centre comes out clean or with a few crumbs.
Let the cake cool for 20 minutes before removing it from the pan and placing it on a serving plate.
Pour the glaze on top.
Glaze
Little by little add the orange juice to the powdered sugar and mix until smooth. The consistency should be liquid but not too runny.
Notes
Store the cake for 2-3 days in the fridge, covered.
The cake on the photos was made in a 7 inch/ 18 cm pan. You can make a lower cake by using a slightly larger pan. Consider that the lower is the cake, the faster it will be baked.
Cardamom can be quite strong so 3 pods (about ¾ tsp) are quite a moderate quantity to add. If you really love cardamom, feel free to increase it.
If your blood oranges are not red enough to colour the glaze, add ½ - 1 teaspoon of beetroot powder. You can add more juice and powdered sugar to accomplish the desired shade.
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