This is an excerpt from MS Douce 257
(England, 1381)
The original source can be found at
MedievalCookery.com
Lopister. Tak a pound of rys. Les hem wel & wasch, & seþ tyl þey breste & lat hem kele; & do þereto mylk of to pound of almandys. Nym þe perche or þe lopuster & boyle yt, & kest sugur & salt also þerto, & serue yt forþ.
Recipes with similar titles:
XVI - FOR TO MAKE A LOPISTER (Forme of Cury)
A lopstere (Gentyll manly Cokere (MS Pepys 1047))