Preheat your oven to 340°F (170°C) and line an 8-inch (20 cm) round cake pan with parchment paper.
In a bowl, beat the butter and sugar until light and fluffy.
Add the eggs one at a time, mixing well after each addition.
Stir in the lemon juice and zest.
In a separate bowl, whisk together the flour, baking powder, and salt.
Gradually add the dry ingredients to the wet ingredients, alternating with the milk. Mix until just combined.
Pour the batter into the prepared cake pan and smooth the top.
Bake for about 35 minutes, or until a toothpick inserted into the center comes out clean.
Let the cake cool in the pan for 10 minutes, then transfer it to a wire rack to cool completely.
Dust with powdered sugar before serving.