Dunk the cabbage in a large basin of water to get them wet. Drain.
Sprinkle salt between the leaves by lifting up every leaf and getting salt in there.
Let the cabbages rest for 3 hours. Turn over every hour.
After 3 hours, wash the cabbage under cold running water and remove salt.
Let cabbage drain in a strainer while preparing seasoning
Prepare Porridge and seasoning
While the cabbage is salting make porridge
Combine the water and the sweet rice flour in a small pot. Mix well with a wooden spoon and let it cook over medium heat for about 10 minutes until it starts to bubble.
Remove from the heat and let it cool off completely.
Pour cooled porridge into a large mixing bowl. Add garlic, ginger, onion, fish sauce, and hot pepper flakes.
Mix well with the wooden spoon until the mixture turns into a thin paste.
Add the radish, carrot, and green onion. Mix well.
Assemble Kimchi
In a large bowl, stuff kimchi paste in between each cabbage leaf.
When every leaf in a quarter is covered with paste, wrap an outer leaf around itself and put into your jar or plastic container.
Ferment 1-5 days at room temperature before storing in the refrigerator for up to threee months.