London Bars

Directions

1. 1
   Whisk the egg yolks with the butter and sugar, then sift in the flour. Using your hand or a food processor mix together the flour with the egg mixture, until it turns into a dough. Form a ball and let it rest for 30 minutes in the refrigerator.Preheat the oven to 180C | 360F. Line a medium sized baking tray with parchment paper.Grind the walnuts (I put mine in a food processor, it worked great).Beat the egg whites with a pinch of salt until it turns foamy.
2. 2
   Add gradually the sugar and vanilla, beat until stiff peaks form. Fold in the ground walnut carefully.
3. 3
   Roll out the dough and press it into the prepared baking tray.
4. 4
   Spread the apricot jam over the crust, then the walnut foam over the jam.
5. 5
   Bake the cake for 20-25 minutes, until the crust is baked and the top has a golden brown color. If the top starts to burn, reduce the oven temperature.
6. 6
   Let it cool before slicing.