1½ cups (340 grams) unsalted butter, softened2 cups (400 grams) granulated sugar1½ teaspoons (3 grams) lightly packed lemon zest1½ teaspoons (3 grams) lightly packed lime zest1½ teaspoons (3 grams) lightly packed orange zest6 large eggs (300 grams), room temperature3 cups (375 grams) all-purpose flour¾ teaspoon kosher salt½ teaspoon baking soda1 cup (240 grams) cold sour cream2 tablespoons (30 grams) fresh lemon juice2 tablespoons (30 grams) fresh lime juice2 tablespoons (30 grams) fresh orange juiceCitrus Glaze (recipe follows)
Preheat oven to 325°F (170°C).
In the bowl of a stand mixer fitted with the paddle attachment, beat butter, sugar, and zests 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.
In a medium bowl, whisk together flour, salt, and baking soda. In another medium bowl, whisk together cold sour cream and fresh juices. With mixer on low speed, gradually add flour mixture to butter mixture alternately with sour cream mixture, beginning and ending with flour mixture, beating just until combined after each addition.
Spray a 12- to 15-cup Bundt pan with baking spray with flour. Spoon batter into prepared pan. Tap pan on a kitchen towel-lined counter a few times to settle batter and release any air bubbles.
Bake until a wooden pick inserted near center comes out clean and an instant-read thermometer inserted near center registers 205°F (96°C), 1 hour and 5 minutes to 1 hour and 10 minutes. Let cool in pan for 10 minutes. Invert cake onto a wire rack, and let cool completely. Drizzle Citrus Glaze onto cooled cake to serve.