White lotus dumplings

Name: White lotus dumplings
Ingredients: 4 cups loosely packed (3 ounces) snow pea leaves (leaves only); ¼ cup sesame oil; A generous 5 cups (20 ounces) finely chopped, stemmed fresh shiitake mushrooms, from 1 ½ pounds whole; ½ cup (4 ounces) finely chopped water chestnuts; 2 tablespoons plus ¾ teaspoon (1 ounce) sugar; 2 teaspoons ( ½ ounce) salt; 3 tablespoons (1 ½ ounces) mushroom broth; About ½ cup (2 ounces) wheat starch; Generous ⅓ cup (2 ounces) potato starch; ¼ cup boiling water, more if needed