In a large mixing bowl, mix the white cabbage with the sea salt and knead the salt into the cabbage with clean hands. You can also do this with a masher. It is important that the cabbage is well bruised and starts to look glassy. Toast the cumin seeds in a dry skillet until the fragrance is released, then add them to the cabbage. Mash the cabbage again with your hands or the masher.
Put the shallot, garlic, ginger and turmeric in a food processor and blend to a fine paste. Add the mixture to the cabbage, mash again and mix well. Mix in the miso and stir well.
Scoop the cabbage and the resulting juice into a sterilized weck jar and press firmly. Press the cabbage all the way to the bottom of the jar, leaving a layer of juice on top.
Do not fill the jar completely to the brim; there should always be 1-2 cm to the iron of the lid, leaving room for the movement created by the carbon dioxide released during fermentation. Make sure the rubber is clean when you close the lid.
Let the cabbage ferment at room temperature in a place out of the sun for at least 7 days.
CAUTION
Always work with very clean products. Sterilize the weck jar and mixing bowl and wash your hands thoroughly.