You can start preparing the dough by mixing all the ingredients together :the eggs,butter,sugar powder, flour, baking powder and lemon zest. Until is going to be a very big and non sticky ball of dough

Meanwhile start preparing the filling. Beat 3 egg whites foam,add the sugar and the remaining ingredients and mix until smooth

Take the dough from the fridge and divide it. Like in the picture. 1/3 of the dough put is separately and the other party spread it evenly into the greased tray

Spread the filling over the dough from the tray evenly and than add the chopped nuts

The 1/3 part of the dough we put the separately, mix it with a bit more flour and grate it over the filing from the tray. Use the grater with large holes.

Let it cool slightly and enjoy it with your family! With a cup of tea!