Black Currant Cheesecake

Name: Black Currant Cheesecake
Ingredients: 1/2 cup unsalted butter (4 ounces), at room temperature; 1/3 cup granulated sugar; 2 large egg yolks; 1 teaspoon vanilla extract; 1/4 teaspoon kosher salt; 1 cup all-purpose flour (about 4 1/4 ounces), plus more for hands; Cooking spray; 2 (8-ounce) packages cream cheese, softened; 1/2 cup plus 3 tablespoons granulated sugar, divided; 1 large egg yolk; 1 teaspoon potato starch; 3 large egg whites; 2 cups fresh or thawed frozen black currants (about 12 ounces), divided