In a large bowl, combine the flour, baking soda, baking powder, salt, and poppyseeds. Whisk to remove any clumps and to combine.
In a separate bowl, combine the buttermilk, eggs, sugar, vanilla extract, lemon zest, lemon juice, and melted butter. Whisk until everything is incorporated.
Pour the liquid mixture into the dry ingredients and whisk until combined. It is okay to for your batter to be a little lumpy, as you do not want to over-mix it.
Heat a pan or griddle over medium heat. Once the pan has heated, melt a pat of butter on the pan, enough to coat the bottom of it.
When the butter has melted, pour the batter (about 1/4 cup dollops) onto the pan. Cook for about 2 minutes or until you see bubbles forming on the surface of the batter. Flip the pancakes over and cook for another 2 minutes.
Once the pancakes have cooked, remove them from the pan and serve. Enjoy!