In a bowl, whisk together the all-purpose flour, baking soda, salt, and poppy seeds.

In another bowl, combine the melted butter, eggs, and lemon zest.

Mix until the mixture is smooth and well combined.

Add the buttermilk and mix until incorporated.

Add the fresh lemon juice and mix until combined.

Gradually add the dry ingredients to the wet mixture.

Mix until a smooth, thick batter forms.

Transfer the batter to a lined loaf pan and spread it evenly.

Bake at 350°F (175°C) for 45–55 minutes, or until a toothpick inserted into the center comes out clean.

Remove the cake from the oven and allow it to cool completely.

Slice the cooled cake into even pieces.

Arrange the slices, serve, and enjoy.