Creamy Lime Tart with Shortbread Crust

Ingredients

• 1 cup plus 2 tablespoons all-purpose flour, plus more for rolling
• ¼ cup confectioners sugar
• ½ teaspoon kosher salt
• 6 tablespoons unsalted butter, room temperature
• 1 large egg yolk, lightly beaten
• 6 large eggs
• 1 cup heavy cream
• 1 cup granulated sugar
• 3 teaspoons lime zest
• 1 cup freshly squeezed lime juice
• 2 limes, thinly sliced as garnish, optional