Flaky Blood Orange Tart

Name: Flaky Blood Orange Tart
Ingredients: 1 cup all-purpose flour, plus more for dusting; 1/4 cup plus 2 tablespoons granulated sugar, divided; 1/4 teaspoon baking powder; 1/4 teaspoon kosher salt; 1 stick plus 1 tablespoon unsalted butter, the stick cut into 1/2-inch pieces and chilled; 3 tablespoons ice water; 8 to 10 blood oranges (about 5 ounces each); 1 large egg yolk mixed with 2 tablespoons of water; 1 cup sugar; 1/4 cup water; 2 tablespoons light corn syrup; 3/4 cup heavy cream; 4 tablespoons unsalted butter; 1 1/2 teaspoons gray sea salt, crushed