Zuurkool

Overview

Zuurkool is the Dutch name for fermented white cabbage. Like sauerkraut in English-speaking countries, it is made by salting shredded cabbage so that naturally present lactic acid bacteria turn the sugars in the leaves into acid. The name is broad. The detailed record available for this entry describes one commercial process rather than a national standard.

A commercial process in North Holland

A 2016 trade report on Kramer’s Zuurkool describes how the company works. White cabbage is cored, checked and finely sliced, then salted at 1.5 percent. The shredded cabbage goes into large storage pits, which are sealed and weighted with water-filled plastic sacks. The producer account explains the souring as lactic acid bacteria converting cabbage sugars into lactic acid, and it attributes the presence of these organisms to the air. That is the company’s explanation, not independent microbiological evidence.

The company processed cabbage from late July until shortly before Christmas, with fresh cabbage delivered from the fields during that season. The report gives three to eight weeks in fermentation, depending on temperature and on the structure of the cabbage.

Sourcing

The report places the producer in the Langedijk area of North Holland and says its cabbage comes from growers in Langedijk and from deliveries from Opperdoes, with the white cabbage grown on North Holland soil. These statements describe one supply chain. They do not establish that all Dutch zuurkool is made from North Holland cabbage.

The household tradition

The same report recalls that many households once fermented covered, pressed cabbage in a Keulse pot in the cellar. One company representative describes this from personal experience in a gardening family. It is a modern recollection and does not date the practice or show how widespread it was.

Limits of the record

The 1.5 percent salt figure and the three-to-eight-week interval belong to one industrial operation. They are not safe limits for a home batch. No pH endpoint, temperature range or household storage period is established in this record, and appearance, smell or taste do not show that a batch is safe. Home makers who want to ferment cabbage should work from a tested sauerkraut method, such as the general guidance from the National Center for Home Food Preservation and the University of Minnesota Extension listed in the sources.