To apples (grated or diced) add sugar, vanilla, cinnamon and the walnuts. Puff dough divide into three imaginary parts of which both end mode on vertical strips of 2-3 cm. Spread the filling in the middle part. Do weave strips of dough as * close * filling, alternating left and right strip. Strudel is coated with 1 beaten egg yolk and bake at 180C degrees to browning. Optional is served sprinkled with powdered sugar.