Chocolate Caramel Slice | La Cucina Grandinetti

Ingredients

• 1 cup all purpose flour
• 1/4 cup (packed) golden brown sugar
• 2 teaspoons cornstarch
• 1/4 teaspoon salt
• 1/2 cup (1 stick) chilled unsalted butter, cut into 1/2-inch cubes
• 1 tablespoon ice water
• 1 large egg yolk
• 1 (14-ounce) can sweetened condensed milk
• 1/2 cup (packed) golden brown sugar
• 6 tablespoons (3/4 stick) unsalted butter, diced
• 2 tablespoons golden syrup (such as Lyle's Golden Syrup) or dark corn syrup
• 1 teaspoon vanilla extract
• 6 ounces bittersweet or semisweet chocolate, chopped
• 3 tablespoons whipping cream
• Flaked sea salt (such as Maldon)