Season Pork Belly: Combine 1 teaspoon kosher salt and ¼ teaspoon ground black pepper in a small bowl. Place 1 - 1 ½ pounds pork belly on a large plate and score, criss-crossed, on the fat side (being careful not to cut into the meat, just the fat cap) and rub all over with the salt and pepper (add more, if needed).
Bake: Place pork belly in a large cast iron skillet, fat side up. Cook pork belly, middle rack and uncovered, for 50 minutes; baste halfway through.
Lower Temp: Drop oven temperature to 250℉ and cook for another 40-60 minutes. Feel free to baste one more time. Remove from oven and let cool.
Make Broth: Meanwhile, add 2 tablespoons olive oil to Dutch Oven and bring to medium-high heat. Add 2 teaspoons shallots and 2 teaspoons garlic cloves, stir and let cook until fragrant, about 1 minute. Add 1 ½ teaspoons fresh ginger and 1 teaspoon lemongrass, stir for about 30 seconds and then add in 64 ounces chicken stock. Stir. Bring stock to a simmer and then add 2 ½ tablespoons soy sauce, 1 teaspoon rice wine vinegar, 1 teaspoon lemon juice, ¾ teaspoon kosher salt and ¼ teaspoon sesame oil. Let simmer.
Cook Noodles: Add the carrots, mushrooms and 6 ounces ramen noodles to the broth, let cook until noodles are al dente, about 5-7 minutes (or according to package instructions).
Build Bowls: Divide broth and noodles between four bowls. Add pork belly slices, green onions, poached egg, braised bok choy (if using) and any other topping to each bowl.
Serve: Feel free to garnish with black sesame seeds! Serve and enjoy!
Notes
Poached Egg vs. Soft-Boiled Egg: I much prefer making poached eggs (I think it is so much easier and consistently turns out), but if you want to make soft-boiled eggs then do it!
Ramen Noodles: feel free to use whatever ramen noodles you want - you can use store-bought (reg. or gluten-free) or even make your own if you want.
Storage: the noodles will get a little soggy if you store them overnight in the broth so plan accordingly! If you are serving less than 4 people I might recommend cooking the noodles in batches right before you are going to eat.
Pork Belly Substitutions: If someone in your group doesn't want pork belly they could easily eat the soup with just an egg or you could use chicken, crispy baked tofu, etc.
Make Ahead: feel free to make the pork belly ahead of time and the wrap in plastic wrap and store in the fridge. Then slice and sear in a cast iron skillet on the stove top until warmed through.