For the shortcrust apple tart, quickly mix all ingredients into a shortcrust pastry and let rest for about half an hour.
In the meantime, peel and finely slice the apples. Roll out the shortcrust pastry and line a greased and floured round cake tin with three quarters of the pastry.
Fill in the apples, sprinkle with sugar and cinnamon and roll out the remaining dough to form a “lid”.
Brush with beaten egg and bake the shortcrust apple tart in the oven at 170 °C for about 45-50 minutes.