Cut the napa cabbage into quarters and remove the core.
In a large bowl, dissolve the sea salt in water.
Submerge the cabbage in the saltwater solution and let it soak for 2 hours.
Rinse the cabbage thoroughly under cold water and drain well.
In a separate bowl, mix together grated ginger, minced garlic, sugar, and gochugaru.
Add the chopped green onions and julienned carrot to the spice mixture.
Combine the drained cabbage with the spice mixture and mix thoroughly.
Pack the kimchi tightly into a clean glass jar, leaving some space at the top.
Seal the jar and leave it at room temperature for 1-2 days to ferment.
Once fermented to your liking, refrigerate to slow down the fermentation process.