This is an excerpt from Forme of Cury
(England, 1390)
The original source can be found at
the Project Gutenberg website
SOWPER OF GALYNTYNE. XX.VI. IX. Take powdour of galyngale with sugur and salt and boile it yfere. take brede ytosted. and lay the sewe onoward. and serue it forth.
Other versions of this recipe:
Sowpes of galentyne (Fourme of Curye [Rylands MS 7])
To mak souppes in galentyne (A Noble Boke off Cookry)