This is an excerpt from Delights for Ladies
(England, 1609)
The original source can be found at
Kirrily Robert's website
27 - To make Leach of Almonds. Take halfe a pound of sweet Almonds, and beat them in a mortar; then strain them with a pint of sweet milke from the cow; then put to it one graine of musk, 2 spoonfuls of Rose-water, two ounces of fine sugar, the weight of 3 whole shillings of Isinglass that is very white, and so boyle them; and let all run thorow a strainer: then may you slice the same, and so serve it.
Other versions of this recipe:
Tayle3 (Two Fifteenth-Century Cookery-Books)
Lenten slices (Le Viandier de Taillevent)
TAILLIS to be served in Lent (Le Menagier de Paris)
Taylours (Two Fifteenth-Century Cookery-Books)
Tayloures (Two Fifteenth-Century Cookery-Books)