Combine flour, sugar, and salt; cut in butter until crumbly.
Mix yolk and vanilla; add ice water until dough forms.
Chill, roll out, and pre-bake crust at 375°F for 15 minutes.
Cook sugar until amber, whisk in butter, cream, salt, and vanilla.
Cool caramel, temper eggs, combine, pour into crust.
Bake at 350°F for 25–30 min; cool and chill 4 hrs.
Whip cream, sugar, and caramel; spread over pie.
Sprinkle sea salt; slice and serve.