Prepare the crust. In a bowl or food processor, combine butter, flour, sugar, and salt. Knead or pulse. Slowly add in the liquid. Continue to knead or pulse until dough comes together. Shape into a flat disc and wrap in plastic wrap. Place in the refrigerator while you prepare the filling (you can also prepare the dough a few days in advance.)
Prepare the filling. Combine all ingredients in a saute pan over medium heat. Cook for 5-7 minutes, until sugar caramelizes and liquifies and apples soften.
Remove dough from the refrigerator. It should be nice and chilled. If it’s too warm, put it back into the fridge. On a piece of parchment paper, roll out dough into a circle. It doesn’t need to be perfect.
Add filling to center and fold over the edges. Brush with heavy cream and sugar in the raw. Bake for 45-50 minutes, or until filling is golden.
Drizzle with caramel and serve with vanilla ice cream.