Cut leek lengthwise and clean well. Cut each half vertically in half again. Slice very finely across the leek.
Check your package instructions for the dumplings. If they are already cooked you can choose to fry them lightly in vegetable oil and set them aside. If they need to be steamed or cooked then add them to broth at the very beginning.
Put broth in a large sauce pan. Add the vegetables and soy sauce. Add the dumplings if you are going to cook the in the broth. Simmer about 15 minutes.
If you fried the dumplings add them to the broth now.
Check the seasoning and add ½ teaspoon salt or to taste.
Simmer another 5 minutes until everything is heated through.
Serve in bowls with a squeeze of fresh lime if desired.