Chinese Lion's Head Pork Meatballs With Vermicelli and Cabba

Ingredients

• block firm tofu, cut into 1/4-inch slices
• ounces ground pork, such as pork shoulder
• ounces ground or minced fatty pork, such as fresh pork belly
• drained canned water chestnuts, diced
• teaspoon minced peeled ginger
• scallions, white parts finely minced and green parts thinly sliced, divided
• egg yolk
• teaspoon sugar
• teaspoons Shaoxing wine
• teaspoon kosher salt
• teaspoons minced garlic , divided
• teaspoon ground white pepper, divided
• teaspoons soy sauce, divided
• teaspoons cornstarch, divided
• tablespoons plus 1 teaspoon canola, vegetable, or peanut oil, divided
• homemade chicken stock or low-sodium broth
• heads baby bok choy, halved
• Napa cabbage leaves from 1 head, cut into 2-inch pieces, thick stalk and leafy p
• packs dried vermicelli noodles
• Cooked white rice, for serving