Sichuan Braised Cod

Name: Sichuan Braised Cod
Ingredients: 2 teaspoons cornstarch; 2 tablespoons rice vinegar, unseasoned (to taste); 3⁄4 cup chicken broth, low salt; 1⁄4 tablespoon soy sauce; 1 tablespoon ketchup; 1 1⁄2 lbs cod fish fillets, thick (often called cod loins, cut into 4 uniform pieces); 1⁄2 teaspoon salt, kosher, to taste; 1⁄2 teaspoon black pepper, to taste; 1⁄2 cup cornstarch; 2 eggs, beaten; 3 tablespoons canola oil (or peanut oil); 10 dried thail chilies or 10 other small whole chilies; 4 scallions, thinly sliced, white and green parts separated; 1 1⁄2 tablespoons ginger, minced