Fry an onion in butter (or vegetable oil), add sauerkraut and cook. Boil the fish in salt water, then bone and shred. Fry two minced onions in butter or oil, put them into the kettle with the fish, add two egg yolks, butter or oil, a little pepper and a tablespoon of breadcrumbs; steam for half hour and serve with the kraut.
The International Jewish Cook Book (1919).