1¼ cups (250 grams) granulated sugar½ cup (112 grams) neutral oil, plus more for scoring loaf3 tablespoons (12 grams) lemon zest3 large eggs (150 grams), room temperature2 cups (250 grams) all-purpose flour2 teaspoons (10 grams) baking powder½ teaspoon (1.5 grams) kosher salt½ cup (120 grams) whole buttermilk, room temperature5 tablespoons plus 2 teaspoons (85 grams) fresh lemon juice, divided1½ cups (180 grams) confectioners’ sugar1 tablespoon (14 grams) unsalted butter, melted
Preheat oven to 350°F (180°C). Spray an 8½x4½-inch loaf pan with baking spray with flour. Line pan with parchment paper, letting excess extend over sides of pan.
In the bowl of a stand mixer fitted with the paddle attachment, beat granulated sugar, oil, and lemon zest at medium speed until fluffy, 2 to 3 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, baking powder, and salt. In a liquid-measuring cup, combine buttermilk and 3 tablespoons (45 grams) lemon juice. With mixer on low speed, gradually add flour mixture to sugar mixture alternately with buttermilk mixture, beginning and ending with flour mixture, beating just until combined after each addition. Using an offset spatula, spread batter into prepared pan. Wipe offset spatula clean, and dip into oil. Using oiled offset spatula, score a 3- to 4-inch line lengthwise down center of batter.
Bake until a wooden pick inserted in center comes out with a few moist crumbs, 45 to 50 minutes. Let cool in pan for 15 minutes. Using excess parchment as handles, remove from pan, and let cool completely on a wire rack.
In another small bowl, whisk together confectioners’ sugar, melted butter, and remaining 2 tablespoons plus 2 teaspoons (40 grams) lemon juice until smooth; pour onto cooled cake. Let stand until glaze is set before serving, about 10 minutes. Store in an airtight container for up to 3 days.
*pro tip
The line of oil on top of the batter helps create a domed rise and signature lengthwise crack on the top of the loaf.