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
BLACK PEPPER. Take a clove and a little pepper, ginger, and grind very fine: then grind toasted bread soaked in a little liquid from the meat or in a little cabbage-water which is better, then boil in an iron pan, and when boiling add vinegar; then put in a pot on the fire to keep hot.
Item, some add cinnamon to it.
Other versions of this recipe:
Black Pepper [Sauce] (Le Viandier de Taillevent)
Pepper sauce that is genuine (Libro di cucina / Libro per cuoco)
To make a pepper sauce (Wel ende edelike spijse)