To start, get rid of the outer cabbage leaves, rinse the cabbage heads well to remove dirt and debris.
Put the cabbage head on cutting board and use a sharp knife to cut out the core. Try to cut deep enough to remove the whole core.
Put the cabbage head into a deep jar or container.
In the whole of the core add salt to better soften the stems.
In a large pot bring about 1 liter of water to boil and add the rest of the salt, mix together the salt with water and stir well. Roughly 1⅕oz salt to 1 litter which makes this makes a 3.5% concentration.
Press the cabbage down done to reduce oxygen to a minimum.
Pour the boiling water into the pot. Close the pot or jar with the lid and make sure it it tight. Shake it and leave it in a room temperature for up to 5 days.