1½ cups all-purpose flour
1 tsp baking powder
½ tsp salt
½ cup unsalted butter, softened
1 cup sugar
2 large eggs, at room temperature
½ cup buttermilk
Zest of 1 lemon, finely chopped or grated
Glaze:
Juice of 1 lemon
4 tbsp conf. sugar
Preheat oven to 325 degrees. Spray a 8x5x3 loaf pan or line with parchment paper.
Whisk together the flour, baking powder, and salt until well blended. With a hand mixer, beat the butter until it’s very pale and little tails have formed. Add the sugar and beat well until slightly fluffy. Scrape the sides of the bowl well. Add eggs one at a time, beating until blended before adding the next.
With the mixer on low, add about one-third of the flour and mix until almost combined; then add half the buttermilk and mix until just combined. Repeat with another third of the flour, and then the last half of the buttermilk, ending with the last third of flour. Just before all the flour is blended in, switch to a rubber spatula and add the lemon zest, and slowly stir to blend in the flour and zest, taking care to scrape the bowl’s bottom and sides.
Scrape the batter into prepared pan and bake until the cake is golden brown and a toothpick comes out with just a few crumbs clinging to it when inserted in the center, 45 to 50 minutes. Let the cake cool for about 10 minutes; as it’s cooling, stir together the lemon juice and conf. sugar. Carefully invert the loaf pan, tap it to release the cake, and then brush the glaze on the cake while it’s still warm. Cool completely on a rack before serving.