Combine the first 8 ingredients in a large Dutch oven, and bring vegetable mixture to a boil. Partially cover, reduce heat, and simmer over low heat 20 minutes. Add pork. Bring mixture to a boil; cover, reduce heat, and simmer 35 minutes or until pork is tender. Remove ginger slices with a slotted spoon, and discard. Add spinach, and cook 1 minute or until wilted. Place spaghetti into each of 5 large bowls, and top with broth mixture.