Step 1: Prepare the Apple Filling
In a large bowl, combine the sliced apples with sugar, flour, and cinnamon. Let the mixture sit while you make the dough. This helps the sugar and flour thicken into a syrupy glaze around the fruit.
Step 2: Make the Dough
In a bowl, whisk together the flour, salt, and sugar. Cut in the shortening with a pastry cutter until the mixture resembles coarse crumbs. In a measuring cup, add the egg yolks and enough water to make 1 cup. Stir this into the flour mixture until a dough forms. Divide into two equal portions.
Step 3: Bottom Layer
Roll out one portion of dough into a rectangle large enough to fit a 10×15-inch jelly roll pan. Press it into the bottom and slightly up the sides to create a “bowl” for the apple filling.
Step 4: Add Filling and Top Layer
Spread the apple mixture evenly over the bottom crust. Roll out the second portion of dough and place it on top. Pinch the edges together to seal the strudel.
Step 5: Bake
Brush the top with the reserved egg white. Cut a few slits in the top to release steam. Bake at 350°F for 45–60 minutes, until the crust is golden brown and the filling is bubbling.
Step 6: Glaze and Cool
While the strudel is still hot, mix together powdered sugar, milk, and vanilla. Spread it over the top immediately. Allow the strudel to cool completely before cutting into squares.
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