Mix butter with egg and powdered sugar until creamy and work with flour on a board to form a kneading dough. Chill for about 30 minutes.
Mix the nuts with the sugar, orange juice and peel well. Divide the dough, roll out 2 parts in the size of the shape (30 x 20 cm or square). Put one part in the prepared form and brush with the filling.
Put the 2nd sheet of dough on top and bake in a preheated oven at 150 ° C for 25-30 minutes.
For the glaze, mix the orange juice with powdered sugar and spread it over the hot cake. Then cut into slices when cold.