Boil water in a small pot for 5 minutes. Wash and chop up the cabbage.

Put the chopped cabbage and the water into a blender.

Blend the cabbage and water together at low speed. The reason you spend most of the blending time at low speed is to prevent oxidation. Then blend the mixture on high for about 10 seconds.

Place a mesh strainer over a clean, empty jar. Use the strainer to separate as much of the cabbage liquid from the solid cabbage parts as possible.

Pour the leftovers through the strainer and into a second jar. Pour the extra juice from the second jar into the first jar.

Store in the fridge until ready to use, and serve chilled.