Lachs galt in Skandinavien bis in die Neuzeit hinein als „Armeleuteessen“.
Geht superschnell und ist super lecker. Statt Wacholderbutter kann man auch prima Kräuterbutter nehmen. Als Beilage gab es glasiertes Wurzelgemüse und Brot.
One of the Lenten strictures medieval nobles found most annoying was not eating meat for 40 days (the peasants didn't mind much because they rarely got to eat meat, anyway). As the centuries wore on, the Church's definition of "meat" became looser and looser until it excluded seafood, unborn animals and, in Poland, anything served on a Wednesday (a boon given by the pope to the Bishop of Prock in the mid 16th century).
One popular "non-meat" main dish found in Fabulous Feasts sounds more like a product of California's spa cuisine than a medieval kitchen.
Pelner, Fabulous Feasts; Shire of Vanished Wood Cooking Guild, SCA