Pork and Cabbage Potstickers

Name: Pork and Cabbage Potstickers
Ingredients: 1⁄4 lb. tender leaves of Chinese cabbage or baby bok choy, roughly chopped; 5 Tbsp. peanut oil; 1⁄2 lb. ground pork; 2 scallions; 1 (1-inch) piece ginger, peeled and minced; 1⁄4 cup dark soy sauce; 1 1⁄2 Tbsp. Shaoxing rice wine; 1 Tbsp. light soy sauce; 1 tsp. sugar; 3 tsp. sesame oil; Kosher salt and freshly ground black pepper; 30 (3-inch) round dumpling wrappers; 2 Tbsp. black vinegar