Preheat oven to 350°F (175°C).
Grease and flour a 9-inch round or square cake pan.
In a large bowl, cream together softened butter and sugar using an electric mixer until light and fluffy.
Add eggs one at a time, beating well after each addition.
Stir in the fresh lemon juice and zest.
In another bowl, whisk together sifted flour, baking powder, and salt to ensure it’s light and airy. This helps avoid lumps and ensures an even texture in the cake.
Gradually add the dry ingredients to the wet ingredients, alternating with milk, starting and ending with the dry ingredients.
Mix until just combined; do not overmix.
Pour the batter into the prepared cake pan.
Bake for 25–30 minutes, or until a toothpick inserted into the center comes out clean.
Let the cake cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.
Serve as is or frost with your favorite glaze or frosting.