Cleaning Cabbage

What is the correct method of soaking cabbage that I want to eat uncooked? What ratio of salt to water and for how long?

Shalom!

Thank you for your question.

Since it is very difficult to check cabbage one should only buy cabbage that has a reliable hechsher that covers all Halachos like Terumot and Ma'asrot, but also verifies that it was grown in a bug-free environment, Nevertheless, it is not a hundred percent sure, so the cabbage still needs to be cleaned as follows;

Separate the leaves and soak them in soapy water for three minutes then rinse each leaf Individually.

This may not be done on Shabbos.