Grapefruit Cookies

Makes 15 sandwich cookies

Grated zest of 1 Ruby Red grapefruit, plus 1/4 cup freshly squeezed juice
1 cup sugar
1 1/2 cups all-purpose flour, plus more for work surface
3/4 cup cake flour (not self-rising)
1 teaspoon baking powder
1/2 teaspoon salt
1/2 cup (1 stick) unsalted butter, softened
2 large egg yolks

Pink Grapefruit Cream Filling

Directions
Preheat oven to 350 degrees.

Line a baking sheet with parchment paper; set aside. In a small bowl, combine zest with 1 tablespoon sugar; set aside. In a medium bowl, whisk together both flours, baking powder, and salt; set aside.

In the bowl of an electric mixer fitted with the paddle attachment, beat butter and remaining sugar on medium-high speed until light and fluffy, about 2 minutes, scraping down sides of bowl as needed. Add egg yolks, and beat until combined, scraping down sides of bowl as needed. Beat in reserved zest-sugar mixture. Add flour mixture in two batches, alternating with the juice, and beat to combine.

Turn out dough onto a piece of plastic wrap, and shape into a 1-inch-thick disk. Wrap in plastic, and refrigerate until firm, about 30 minutes.

On a lightly floured work surface, roll out disk to 1/8 inch thick using a lightly floured rolling pin. Using a lightly floured 2-inch round cookie cutter, cut out rounds and place about 1 inch apart on prepared sheet. Bake, rotating sheet halfway through, until edges are golden, 18 to 20 minutes. Transfer sheet to a wire rack to cool 5 minutes. Transfer parchment paper and cookies to rack to cool completely.

Using an offset spatula, spread 1 tablespoon filling onto flat sides of half the cookies. Sandwich with remaining cookies, keeping flat sides down. Once filled, cookies