Ginger Meatball Ramen With Greens and Scallions

Name: Ginger Meatball Ramen With Greens and Scallions
Ingredients: 1 ½ pounds ground pork; 2 large eggs; ¾ teaspoon freshly ground black pepper; 4 scallions, thinly sliced, divided, plus more for serving; 1 tablespoon grated fresh ginger (from a 3-in. piece), divided; 3 tablespoons soy sauce, divided; 3 tablespoons sesame oil, divided; 2 tablespoons canola oil; 1 quart vegetable broth; 2 tablespoons mirin; ¼ cup white miso; 4 3-oz. pkg. instant ramen noodles or 3 (10-oz.) pkg. fresh ramen noodles; 6 heads baby bok choy, trimmed and halved; Nori, cut into strips, for serving