10-ounce package frozen spinach, defrosted
1/4 cabbage, grated on large holes of box grater
2 teaspoons salt
1 pound ground pork
2 teaspoons grated fresh ginger
2 cloves garlic, finely minced
1 tablespoon soy sauce
1 tablespoon Chinese rice wine (or dry sherry)
2 teaspoons roasted sesame oil
1 tablespoon cornstarch
16-ounce package of wonton wrappers (about 50 wrappers), defrosted (see note)
For the slurry: 1/4 cup cool water + 1 tablespoon cornstarch

FOR THE GINGER BROTH
2 quarts vegetable or chicken broth
2 thumb-sized pieces of ginger, sliced
sprigs of cilantro, optional