This is an excerpt from Forme of Cury
(England, 1390)
The original source can be found at
the Project Gutenberg website
XI - FOR TO MAKE LAMPREYS IN BRUET. They schulle be schaldyd and ysode and ybrulyd upon a gredern and grynd peper and safroun and do ther'to and boyle it and do the Lomprey ther'yn and serve yt forth.
Other versions of this recipe:
Lamprayes in browet (Liber cure cocorum [Sloane MS 1986])
Lamprays in brewte (Gentyll manly Cokere (MS Pepys 1047))
Lamprey in Bruet (A Noble Boke off Cookry)
Recipes with similar titles:
Lampreys in bruet (MS Douce 257)