> I also buy from Italians at a farmers market here in Switzerland rotten anchovies packed in salt and ground peppercorns.

Does this condiment have a specific name?

I have a bottle of Colatura di Alici in my fridge. It's great when I remember to use it. But it costs about ten times as much as a Southeast Asian fish sauce, which is a natural consequence of only being produced in one town in Italy.