The recipe nails it right out of the gate with "taketh one unicorne". It then instructs readers to marinate the magical horse in garlic and cloves before roasting it all on a griddle. The remains obviously go in this receptacle, which we'd assume is subtly decorated with silver glitter to distinguish it from other animal bits buckets.
History may never know if our buddy Geoffrey was actually serving up unicorn entrees or just messing with future generations. But if you ever need to make a bunch of toddlers cry real fast, here's your new go-to.