Wash the cabbage thoroughly and cut it into bite-sized pieces.
Chop the green onions, garlic, and ginger.
Sprinkle sea salt over the cabbage and let it sit for 30 minutes, then rinse lightly with water.
In a bowl, mix chili powder, minced garlic, minced ginger, salted shrimp, sugar, and salt to make the seasoning sauce.
Add the salted cabbage and green onions to the seasoning sauce and mix well.
Store in an airtight container and let it ferment at room temperature for 1-2 days, then refrigerate.