Mix the butter with the flour and salt.
Add the egg and milk and mix it all together to a soft dough.
Wrap plastic film around the dough and place in the fridge for 30 minutes.
Start the oven at 180 degrees Celsius.
Time to make the filling by starting to blend the walnut kernels in a blender.
Mix the eggs and sugar fluffy.
Add the walnuts to the egg mixture and mix gently. Add the cream and mix well.
Roll out the dough and cover a pie form.
Pour the filling in the form and place in the middle of the oven for 40 minutes.
Take out the tart and let it cool down.
Decorate the tart with some whip cream and walnuts before serving it.