A boy had been out and collected a whole pot full of common sorrel with both leaves and stalks. This was all put in a pan with a little water in the bottom and stirred and boiled for a long time until everything had dissolved, after which it was mixed with milk in large casks. When it had all stood for a while, it took on a pleasant sourish taste quite different from when it is fresh. These casks are then put in pits in the ground and walled up or even buried with birch bark placed around them to prevent mice from eating them.