Fennel pollen is the most potent form of fennel, but also the most expensive part of the anise plant. The yellow pollen is picked and dried and used to season many dishes. After the pollen has dried, it has a tan/brown color to it and is very fragrant. It is by far my favorite part of the anise plant to use, next to the bulb. Fennel pollen is one of those ingredients that can completely transform a dish and is usually one of my secret ingredients when cooking. Amazon has it available through multiple suppliers.