So my suggestion can be to order a different brand name of ground poppy seeds, if you can. A touch of bitterness is normal, and can be well balanced out by incorporating sugar or honey during the cake batter. But if it’s an disagreeable bitterness, this shouldn’t be the situation. https://driedpoppypodsforcrafts81111.arwebo.com/54831782/austrian-poppy-seed-cake-an-overview