For these three seeds, here are the steps you need to take when turning them into powder:
Preheat your frying pan using a low-heat setting.
Place enough amount of the seeds in your hot pan and adjust the heat to a medium setting
Allow the seeds to toast for three to four minutes, making sure you stir them occasionally to avoid burning.
Once they look darker than their original color, remove the pan from the heat and transfer the toasted seeds to a bowl. I suggest you do a taste test of one of the seeds to check if it isn't bitter, indicating you over-toasted the seeds.
If everything seems good, transfer the toasted seeds to your mortar and pestle's mortar (bowl), spice grinder, or coffee grinder.
Grind them until you have a fine powder.
That's it! You're now ready to use the powder to add flavor to your dish, sauce, dip, or marinade.