Lions Head Meatball Burgers

Name: Lion's Head Meatball Burgers
Ingredients: 1/2 head napa cabbage, finely shredded; 4 scallions, chopped; 1 garlic clove, smashed; One 2-inch piece fresh ginger, peeled and sliced into coins; 1 cup water; 1/2 cup unseasoned rice vinegar; 1/4 cup granulated sugar; 1 1/2 tablespoons kosher salt; 2 teaspoons toasted sesame oil; 2 1/2 pounds (1134 grams) ground pork; 1/4 cup (32 grams) cornstarch; 2 tablespoons (32 grams) sambal oelek; 2 tablespoons (36 grams) hoisin sauce; 2 tablespoons (30 grams) soy sauce; 1 tablespoon unseasoned rice vinegar; 1 tablespoon toasted sesame oil; 2 teaspoons kosher salt, plus more for seasoning; 2 teaspoons five-spice powder; 3-inch piece of fresh ginger, peeled and finely grated (about 2 tablespoons); 3 large cloves garlic, finely grated; 4 scallions, minced; Neutral oil, for cooking the burgers and eggs; Kosher salt; 6 large eggs; Hoisin, for serving; 6 brioche or challah burger buns, halved and lightly toasted; Japanese mayonnaise, such as Kewpie, for serving; Sriracha, for serving; Quick-Pickled Cabbage & Scallions (see recipe)