This is an excerpt from Wel ende edelike spijse
(Dutch, late 15th c. - Christianne Muusers, trans.)
The original source can be found at
Christianne Muusers's website
Whisked (?) greens. Bring the white of leeks, chopped finely, boiled and drained, again to the boil with wine and some water. Cook salmon in it, and onion, well fried, and dried herring. Add saffron, pepper and salt and let cool.