White Lotus Dumplings

Name: White Lotus Dumplings
Ingredients: 4 cups loosely packed (3 ounces) snow pea leaves (leaves only); 1/4 cup sesame oil; A generous 5 cups (20 ounces) finely chopped, stemmed fresh shiitake mushrooms, from 1½ pounds whole; 1/2 cup (4 ounces) finely chopped water chestnuts; 2 tablespoons plus ¾ teaspoon (1 ounce) sugar; 2 teaspoons (½ ounce) salt; 3 tablespoons (1½ ounces) mushroom broth; About ½ cup (2 ounces) wheat starch; Generous 1/3 cup (2 ounces) potato starch; 1/4 cup boiling water, more if needed