I recommend using Smucker's Simply Delights or Trader Joe's Fleur de Sel prepared caramel sauces for this recipe. You need about 1 cup of caramel sauce - 1/2 cup for the pie filling, and about 1/2 cup to serve with the baked and cooled pie. For a true salted caramel flavor, I recommend garnishing the pie with the remaining salted caramel sauce tableside or pour the caramel sauce onto the finished pie before serving. If your caramel sauce is already pre-salted, omit the flaky sea salt topping. If your caramel sauce does not already have salt, flaky sea salt is a nice touch.