Orange Meringue Cupcakes

Name: Orange Meringue Cupcakes
Ingredients: 2 cups cake flour (see Cook's Note); 2 teaspoons baking powder; 1/2 teaspoon fine salt; 1 2/3 cups sugar; 1 teaspoon finely grated orange zest; 2 sticks (1 cup) unsalted butter, cut into pieces, at room temperature; 1/2 cup milk, at room temperature; 2 teaspoons pure vanilla extract; 3 large eggs, at room temperature; 8 large egg whites; 1 1/3 cups sugar; 2 teaspoons orange juice plus 1 teaspoon finely grated orange zest and more, for serving; Pinch of cream of tartar; Pinch of fine salt