So my recommendation might be to order a unique model of ground poppy seeds, if you can. A hint of bitterness is usual, and might be balanced out by introducing sugar or honey in the cake batter. However, if it’s an uncomfortable bitterness, this shouldn’t be the case. -edit- Also https://zionlppnk.estate-blog.com/31298043/the-ultimate-guide-to-dried-poppy-pods-for-crafts