In a food processor add flour, salt and sugar, whisk to combine, then add the butter and pulse a few times, add egg and pulse to combine (3 or 4 pulses), add milk a little at a time and pulse to bring dough together. Remove to a lightly floured flat surface and knead until dough is smooth. Wrap in plastic and refrigerate for 30 minutes.
FOR THE CINNAMON APPLE FILLING
While dough is in the fridge, prepare the filling, Cut washed, peeled, cored apples into small to medium cubes. Place in a medium bowl and sprinkle with lemon juice, then add the brown sugar, almonds (leave some for sprinkling on top of unbaked strudel), cinnamon and half the melted butter. Set aside.
Pre-heat oven to 350F (180C), line a cookie sheet with parchment paper.
Remove the dough from fridge and roll into a rectangular shape**, roll 1/8 inch thick, place on prepared cookie sheet, brush dough with the remaining half of the melted butter, spoon the apple mixture down the middle of the dough, make slits in dough, (see image), and criss cross cut slits over mixture (see image). Brush top of pastry with beaten egg, sprinkle with slivered almonds and bake for approximately 30-40 minutes or until golden brown. Let cool before drizzling with Maple Syrup Glaze or Icing Sugar. Or eat warm. Enjoy!
MAPLE SYRUP GLAZE
In a small bowl mix together powdered/icing sugar, vanilla and maple syrup and cream or milk. (add more milk or cream (a little at a time) if too thick, or more powdered sugar if too thin).
**Roll into a 10 x 12.5 inch (25 x 32cm) rectangle, cut the edges even with a knife, leftover dough can be frozen or made into tarts.