Layered Grapefruit Cake
 
Makes 1 (9-inch) cake
Ingredients
  • ¾ cup (170 grams) unsalted butter, softened
  • 1½ cups (300 grams) granulated sugar
  • ¼ cup (25 grams) grapefruit zest (about 4 large grapefruits)
  • 3 large eggs (150 grams), room temperature
  • 1 tablespoon (15 grams) fresh grapefruit juice, room temperature
  • 1 teaspoon (4 grams) vanilla extract
  • 1¾ cups (219 grams) all-purpose flour
  • 2 teaspoons (10 grams) baking powder
  • 1 teaspoon (3 grams) kosher salt
  • ½ cup (120 grams) whole milk, room temperature
  • Pink gel food coloring
  • Vanilla Whipped Topping (recipe follows), divided
  • 2½ tablespoons (37.5 grams) Campari
Instructions
  1. Preheat oven to 325°F (170°C). Spray a 9-inch springform pan with baking spray with flour. Line bottom of pan with parchment paper.
  2. In the bowl of a stand mixer fitted with the paddle attachment, beat butter, sugar, and grapefruit zest at medium speed until fluffy, 3 to 4 minutes, stopping to scrape sides of bowl. Add eggs, one at a time, beating well after each addition. Beat in grapefruit juice and vanilla. (Mixture may look slightly curdled at this point, but batter will come together.)
  3. In a medium bowl, whisk together flour, baking powder, and salt. In a small bowl, stir together milk and food coloring*. With mixer on low speed, gradually add flour mixture to butter mixture alternately with milk mixture, beating until combined after each addition and stopping to scrape sides of bowl. Spoon batter into prepared pan, smoothing top with a small offset spatula.
  4. Bake for 35 minutes; cover with foil, and bake until a wooden pick inserted in center comes out clean, 5 to 7 minutes more. Let cool in pan for 5 minutes. Remove sides of pan; let cake cool completely on base of pan on a wire rack.
  5. Using a serrated knife, level cooled cake. Wrap a 30×4-inch strip of parchment paper around top half of cake, fitting it flush around sides to form a collar; securely staple together. (You can use more than one strip of parchment, if necessary.) Replace sides of pan.
  6. In a medium bowl, stir together 2¼ cups (330 grams) Vanilla Whipped Topping and Campari until well combined. Transfer Campari topping to a pastry bag, and cut a ½-inch opening in tip; pipe evenly onto cake. Using a small offset spatula, spread into an even layer. Using a paper towel, clean any smears of Campari topping off parchment. Freeze for 25 minutes.
  7. Whisk remaining Vanilla Whipped Topping until thickened, if necessary; spoon onto frozen Campari topping, smoothing into an even layer and swirling as desired using the back of a spoon. Loosely cover and refrigerate for at least 4 hours or up to overnight.
  8. Carefully remove sides of pan and parchment. Smooth sides and patch any holes in topping, if necessary. Serve immediately.
Recipe by Bake from Scratch at https://www.bakefromscratch.com/layered-grapefruit-cake/