A word from the creator:
“This cookie is based on the shape of a unicorn horn, using cream horn forms. I hope that makes sense. :D Check it out, it’s very close to the instructions on my Unicorn Poop Cookies, but these have an added surprise inside! They would make AWESOME party favors for a little princess party, or even for a mythical event. Unicorns are for everyone, so enjoy!!”
(via Instructables)
