Preheat the oven to 180 degree centigrade.
Line a 9" round cake pan with parchment paper.
Grease and dust the pan with butter and flour.
Add half the shifted flour to the egg yolk mixture and gently fold it.
Add half the egg whites to this and gently fold in.
Repeat both the steps again.
Now add the chopped walnuts and gently fold into the batter
Pour the batter I into the prepared cake tin and bake in the preheated oven for 30 minutes or a skewer inserted in the centre comes out clean.
Remove from the oven and let it cool on a cooling rack for 10 minutes
Remove from cake tin and cool completely before slicing.
Serve plain or with whipped cream.
