Daffodil Cake

Name: Daffodil Cake
Prep time: 25 min
Cook time: 35 min
Total time: 1 h
Cuisine: American
Ingredients: 1 1/4 cups all purpose flour or cake flour; 1 1/2 cups granulated sugar (divided); 1 1/4 teaspoons kosher salt (divided); 12 large egg whites + 6 large egg yolks (at room temperature); 1 1/2 teaspoons grated lemon zest + 2 tablespoons lemon juice; 1 teaspoon grated orange zest + 1 tablespoon orange juice; 1 teaspoon cream of tartar; 2 cups confectioners sugar (sometimes called icing sugar); 2 - 3 tablespoons lemon juice; 1/2 teaspoon orange zest + 1 tablespoon orange juice; 2 tablespoons melted butter; edible flowers