This is an excerpt from Een notabel boecxken van cokeryen
(Netherlands, ca. 1510 - C. van Tets, trans.)
The original source can be found at
Willy Van Cammeren's website
To make lenten pancakes. Take fine flour which you shall beat up with yeast. Then make dough from it. Then, from the same dough, one shall take a small lump and make it square [and] very thin, in any case as thin as it is possible to make, until small holes appear. Then fry them well in rape oil. Some, who wish to, fry raisins therein and they stick them one here and there and also small pieces of apple.