Grapefruit and Basil Sugar Cookies

Name: Grapefruit and Basil Sugar Cookies
Ingredients: 4 cups all-purpose flour, plus more for dusting (see Cook's Note); 1/4 teaspoon baking soda; 1 teaspoon fine salt; 2 large eggs; 1 teaspoon pure vanilla extract; 3 sticks (1 1/2 cups) unsalted butter, at room temperature; 1 cup granulated sugar; 1/2 cup confectioners' sugar; 1 tablespoon plus 1 teaspoon grapefruit zest; 2 teaspoon finely chopped basil; 3 1/2 cups confectioners' sugar; 2 tablespoons meringue powder; 1/4 to 1/3 cup grapefruit juice; Gel food coloring, for decorating