Classic Egg Rolls

Name: Classic Egg Rolls
Ingredients: 2 cups store-bought duck sauce; 2 tablespoons apple cider vinegar; 1 teaspoon garlic powder; Kosher salt; 2 cups shredded carrots; 2 cups shredded celery (about 4 stalks); 5 scallions, thinly sliced; 8 cups shredded napa or Chinese cabbage (about 1 head); 1 tablespoon sesame oil; 1 tablespoon low-sodium soy sauce; 1 tablespoon sugar; 1/2 teaspoon freshly ground black pepper; 1/2 teaspoon Chinese five-spice powder; 3 cups 1/4-inch diced Roasted Pork, recipe follows; 24 peeled and cooked medium shrimp, cut into 1/2-inch dice; All-purpose flour or cornstarch, for dusting; One 18-ounce package 7-inch square egg roll wrappers; 1 large egg, lightly beaten, for egg wash; 1 quart canola oil; Spicy hot mustard, for serving; 1 1/4 to 1 1/2 pounds pork loin, or four 1-inch-thick boneless pork chops; Kosher salt and freshly ground black pepper; 1 tablespoon canola oil