1. Preheat the oven to 350°F (175°C). Grease a loaf tin (about 9×4 inches) and line with some baking parchment. Set aside.

 

2. Zest one of the oranges and set aside. Cut off the skin of both oranges with a sharp knife – you want all of the white parts gone, then cut out the orange filets and collect all of the juice. You need about 4-5 tbsp. of orange juice at the end.

 

3. Add the butter and half of the birch sugar, the cinnamon and a pinch of salt to a large bowl and mix on high speed until light and fluffy. Divide the eggs and add one egg yolk after another to the bowl and mix until well combined. Add the orange juice, orange zest, and almond flour to the bowl and fold in. Add the egg whites to a bowl, add a pinch of salt and mix until foamy. Slowly add the remaining birch sugar and mix until stiff peaks form. Add some of the egg white to the bowl and carefully fold in. Add some more and continue folding it in until all egg white is incorporated – try to keep as much volume as possible. Add half of the orange filets and the ounce of sliced almonds and fold in. Pour the batter into the prepared tin and add the remaining orange filets on top in a line in the center and sprinkle with the tablespoon of sliced almonds. Bake for 45-50 minutes or until a skewer inserted into the center comes out clean. Take out of the oven and let cool down in the tin for about 20 minutes, then remove carefully and let cool down completely on a wire rack.