Preheat your oven to 350°F (175°C). Grease and flour a 9x5 inch loaf pan.
In a large bowl, whisk together the flour, sugar, baking soda, salt, and poppy seeds.
In a separate medium bowl, whisk together the melted butter, eggs, buttermilk, lemon zest, and lemon juice.
Pour the wet ingredients into the dry ingredients and stir until just combined. Be careful not to overmix.
Pour the batter into the prepared loaf pan and spread evenly.
Bake for 50-60 minutes, or until a wooden skewer inserted into the center comes out clean.
Let the bread cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.
