From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:
A good Ointment for Serious Warts.
Make a white turnip hollow inside by taking the pit out, put fresh butter therein, also a fresh hen's egg. Let these articles be rendered by broiling inside, pour through a cloth. with a little rose water added, and boil it till it becomes the consistency of a salve. This is a very reliable ointment.
The grimoire Egyptian Secrets of Albertus Magnus lists this spell.