Remove the leaves and rinse the cabbage in the sink, making sure to remove any dirt you see.
Chop it into medium to large peices by cutting along the stem and then cutting the opposite way in 1 inch sections.
Place cabbage in large container(s) and sprinkle generously with salt. Make sure the salt in incorporated throughly. Leave it there for two hours, turning it every 30 minutes.
Put one cup of water on the stove. Tear up the nori sheet and cut up the mushroom. Add hose to the water, as well as the rice flour. Mix and let simmer until it thickens. Then add the soy sauce.
Strain the mixture and then put the mushroom peices aside to add to the kimchi. Discard the seaweed.
While that cools, cut up the vegetables for your kimchi. I cut the carrot and the daikon radish into sticks and then sliced the celery and green onion thinly. Lastly, I minced the garlic and ginger.
Once the cabbage looks wilted and can bend without snapping it is ready. Rinse it very thoroughly to remove as much salt as you can. Add the gochugaru and mix with your hands. Just make sure to wear gloves to do this. Then add the vegetables and fish sauce. Mix until everything is coated.
Transfer to a clean and sanatized (see note below) containers and press the kimchi down. You can taste it to see if it needs more salt.
Let it ferment at room temperature for 3-5 days. You know it is ready when there is more liquid present and air bubbles appear when you press it down. When you taste it, it is more vinegary. You can now put it in the fridge to eat. It tastes the best after two weeks in the fridge.