Stewed pork meatballs and escarole with crisped shiitakes

Name: Stewed pork meatballs and escarole with crisped shiitakes
Ingredients: ½ cup water; 3 slices of ginger; 1 green onion/scallion; 2 lbs ground pork; 2 eggs; 2 Tbsp rice wine or dry sherry; 2 tsp salt; 3 Tbsp cornstarch; ¼ tsp white pepper; 1/3 cup of water chestnuts, diced finely but not minced; 1 large head of escarole, well rinsed; 1/4-1/3 cups vegetable oil; cornstarch; 4 cups of chicken stock; 4 oz shiitake mushrooms thinly sliced; 1 Tbsp vegetable oil; salt, pepper, and soy sauce