Place all ingredients in a bowl and knead into a smooth dough. Shape into a ball and refrigerate for about an hour. After this time, remove from the fridge and divide into 4 parts. Roll out each part into a cake with a thickness of about 3 mm. Cut discs. Put a portion of roasted apples on each one, stick the edges together and form half moon shape. Repeat the operation until the dough and apples are used up. Place the dough on a baking tray lined with parchment, and brush with beaten egg. Bake in an oven preheated to 180C for about 20 minutes. Serve as desired. You can sprinkle with powdered sugar or pour over the icing.