1. First, rinse the purple cabbage with water.
2. Then, cut it into slices and put in the blender.
3. Blend the purple cabbage slices with a small volume of water for 30 seconds.
4. Filter the blended juice of purple cabbage with a filter, allowing the clarified colourant to be collected in a bowl while the retentate is remained at filter.
5. Then, it is boiled for about 10 seconds with vinegar (It is to remove cabbage's odour and stabilize the purple colour)
6. After that, remove a thin layer that is formed on the solution by filtering it again into a bowl.
7. It is then ready as a natural colourant. =D
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