Oxtail Gyoza

Name: Oxtail Gyoza
Ingredients: 8 ounces cabbage, quartered, cored and cut into large chunks; 1 ounce scallions, trimmed and rough chopped; 1/2 ounce garlic; 1/2 ounce fresh ginger, peeled and rough chopped; 10 ounces cooked oxtail meat; 2 ounces mirin; 2 ounces soy sauce; Kosher salt and freshly ground black pepper; 32 gyoza or round wonton wrappers; 2 cups rice vinegar; 1 1/2 cups soy sauce; 1/4 cup sriracha; 2 tablespoons toasted sesame oil; 1/4 teaspoon xanthan gum; Neutral cooking oil, for cooking