This is an excerpt from Le Menagier de Paris
(France, 1393 - Janet Hinson, trans.)
The original source can be found at
David Friedman's website
In July, ham or fresh pork cooked in yellow water and in grain verjuice, a little ginger and bread: with a grated sauce.
Item, at supper, meat salted in the morning, cooked in water and scallions, be it beef or mutton.
Recipes with similar titles:
gely (Two Fifteenth-Century Cookery-Books)
LV - FOR TO MAKE A GELY (Forme of Cury)
To make jelly (Ouverture de Cuisine)
Gelee (MS Royal 12.C.xii)
A Gelle (Recipes from John Crophill's Commonplace Book)
Gely (MS Douce 257)