Preheat your oven to 350°F (175°C) and prep your loaf pan by greasing and flouring it.

In a large mixing bowl, whisk together the all-purpose flour, baking powder, granulated sugar, and poppy seeds.

In another bowl, cream together the softened butter and sugar until fluffy, then add eggs one at a time, and stir in lemon juice and zest.

Gradually fold the wet ingredients into the dry mixture, alternating with the milk for a smooth batter.

Pour the batter into the prepared loaf pan and bake for 50-60 minutes, or until a toothpick comes out clean.

Let the cake cool in the pan for 10 minutes before transferring to a wire rack to cool completely.