Some more stuff on salt
The Hanse and the Dutch (specifically Zeeland) traded Baiensalz (salt from the Bay de Bourgneuf, Spain and Portugal). This salt trade was possible because it was part of a larger trade network see WIKI german
During the 16th century Zeeland and especially Walcheren was important in this trade and imported, refined and then exported large quantities of salt. Some of this salt traveled over the Rhine to Cologne, where, next to salt from Lüneburg, it was used to salt fish, but also was traded directly, see Trading goods of medieval Cologne and Ventgüter
Here is a map of that flow:
