Amazing Orange Caramel Frosting

Name: Amazing Orange Caramel Frosting
Ingredients: For the Clear Orange Caramel Sauce (makes 1 3/4 cups); • 1 1/2 cups Turbinado sugar; • 1/2 cup water; • 1 tablespoon grated orange zest; • 1 tablespoon fresh lemon juice; • 3/4 cup fresh orange juice; For the final frosting:; • All of the Clear Orange Caramel Sauce; • 2 cups turbinado powdered sugar; • 1/2 cup (1 stick) unsalted butter, cut in tablespoon pieces and slightly softened; • 1/2 cup heavy whipping cream, room temperature; • 1 heaping teaspoon of fleur de sel or Maldon sea salt flakes; • 1 teaspoon pure vanilla extract; • 2 tablespoons orange liqueur,( I used Grand Marnier); For the Flaky Sour Cream pastry dough; • 2 to 2 1/2 cups unbleached all-purpose flour; • 1/2 teaspoon baking soda; • 1/2 teaspoon salt; • 1 tablespoon sugar; • 1 cup (2 sticks) cold unsalted butter, cut into 1/4- inch pieces; • 1 cup cold sour cream