I dehydrated the peel from frozen, on a tray in the oven on around 70 degrees for 3-4 hours. Check if it snaps to see if it is dry enough. Then blitz on speed 6-7 for around 10 seconds.
Can't wait to add this to a few things for a bit of citrus zing!!
Sometimes you just feel like being "cheffy" (is that even a word?)