Put some water to boil in a large pot and place the napa cabbage leaves in. Boil for 4-5 minutes until tender. Take them out of the water and let cool.
Dice one of the napa cabbage leaves. This will be put into the meat mixture.
Add the meat mixture into a bowl along with the diced napa cabbage. Knead with your hands for a minute until everything is perfectly mixed together. Separate the meat mixture into 6.
Add ⅙ of the meat mixture to the base of the leaf. Fold stem end and sides over filling and roll up tightly. Place the cabbage roll into a small pot and repeat with the rest of the meat mixture and the remaining 5 leaves.
Add the Asian Citrus broth over the cabbage in the pot. Cover the pot and boil on medium heat for 15 minutes. Turn off the stove and the cabbage rolls are ready.
*Dashi is a Japanese broth. They sell the granulated dashi in Asian supermarkets. You can also make your own dashi by boiling some bonito flakes in water and straining the bonito flakes out after 15 minutes. The leftover water is dashi.