Shanghainese Lions Head Meatballs

Name: Shanghainese Lion's Head Meatballs
Ingredients: 1 pound ground pork; 3 tablespoons sugar; 1 teaspoon salt; 1 tablespoon shaoxing cooking wine, mirin, or sake; 2 tablespoons soy sauce; 1 tablespoon sesame oil; 1 green onion, chopped finely; 1 teaspoon minced ginger; 2 cloves of garlic, minced (up to 3); 3 large eggs, beaten (2 if you want firmer meatballs); 1/4 cup green bean starch (if unavailable, cornstarch will work just fine); 1 pound bok choy, stems trimmed but otherwise intact