In a large bowl, mix together sugar and flour. Add eggs, hazelnuts, chocolate chips, corn syrup, butter, vanilla and salt. Stir well.
Pour mixture into the pie crust. Bake for 1 hour.
Cool the tart for at least 30 minutes, then drizzle with caramel sauce and sprinkle with sea salt.
Place the flour, sugar and salt in the bowl of a food processor fitted with a steel blade. Pulse a few times to combine.
Add the butter and pulse 12 to 15 times, or until the butter is the size of peas. With the motor running, add the ice water all at once through the feed tube. Keep hitting the pulse button to combine, but stop the machine just before the dough becomes a solid mass.
Turn the dough onto a well-floured board and form into a disk. Wrap with plastic and refrigerate for at least 1 hour.