Chop cabbage very finely and put it in a mixing bowl. Sprinkle 1 tsp salt and toss together; let it sit for 10 minutes. When the cabbage becomes lifeless, squeeze it out to get rid of moisture

Boil noodles and follow package instructions, about 6-7 minutes. Rinse in cold water and drain well. Chop into small pieces

Put pork, cabbage, chives, leek/spring onion, and noodles in a large mixing bowl. Season with soy sauce, sweet rice wine, ginger, sesame oil, and pepper; mix well with your hand until all ingredients are well incorporated

To Shape Half Moon Dumplings:
Put a heaping tbsp of filling in the middle of the wrapper, wet the edges of the wrapper with water using your finger. Fold the wrapper in half and pinch the edges together. Bring both ends toward the center. Pinch the ends together to complete

To Steam The Mandu:
Bring a small amount of water in a large pot to boil

Make sure the steamer doesn't touch the water. Make sure none of the Mandu touches.

Steamer should have a steam liner. When water boils, place the steamer over or in the pot. Cover and steam for 5 minutes. Serve immediately