01 - Preheat oven to 350°F. Grease and flour a 9x5-inch loaf pan or line with parchment paper.
02 - In a large bowl, beat the softened butter and granulated sugar together until light and fluffy, approximately 3 minutes.
03 - Add the eggs one at a time, mixing thoroughly after each addition until fully incorporated.
04 - Stir in the whole milk, fresh lemon juice, and lemon zest until evenly combined. The mixture may appear slightly curdled—this is normal.
05 - In a separate bowl, whisk together the all-purpose flour, baking powder, salt, and poppy seeds until evenly distributed.
06 - Gradually add the dry ingredient mixture to the wet ingredients, folding gently with a spatula until just incorporated. Avoid overmixing.
07 - Pour the batter into the prepared loaf pan and smooth the top with a spatula for an even surface.
08 - Bake for 35 to 40 minutes, or until a toothpick inserted into the center comes out clean. Check at the 35-minute mark to avoid overbaking.
09 - Allow the cake to cool in the pan for 10 minutes, then carefully transfer to a wire rack to cool completely.
10 - Whisk together the powdered sugar and fresh lemon juice until smooth. Drizzle the glaze evenly over the fully cooled cake before slicing and serving.