Preheat the oven to 225 degrees F. Line a baking sheet with parchment paper or a Silpat mat.
Wash the fresh dill sprigs in cold water, then dry very well on a towel or some paper towels.
Remove all the stems from the dill sprigs and place them on a dry towel. Once all the stems are removed, pat them dry one more time.
Evenly scatter the dill on the prepared baking sheet.
Place the baking sheet in the oven for 25 minutes, then check to see how the dill is doing. If it's really dry and crumbles easily, remove it from the oven; if not, keep it in the oven for another 5-10 minutes, as needed, until dried.
Remove from the oven and allow to cool for 10-15 minutes.
Roll it up in parchment paper and crinkle it with your hands until it's crushed well.
Pour into a small glass jar or spice jar and keep stored sealed with an airtight lid in a cool, dry place.