Cut the pork belly into even rectangles, then roll up tightly. Tie with kitchen twine to help it maintain its shape during cooking.
In a saucepan, combine the soy sauce, mirin, sesame oil, sliced ginger, and garlic. Add the rolled pork belly and pour in enough water to cover. Simmer over low heat for 1.5-2 hours, or until the pork is tender and easily pierced with a fork.
Meanwhile, cook the eggs until they are soft-boiled (6-7 minutes), then transfer them to an ice bath. Peel the eggs and, optionally, marinate them in the chashu braising liquid for extra flavor.
Prepare the ramen soup: heat the chicken broth, then add soy sauce, mirin, and a drizzle of sesame oil. Season with salt or other spices to taste.
Cook the ramen noodles according to the package instructions. Drain and divide among serving bowls.
Thinly slice the chashu pork and arrange it over the noodles. Add halved soft-boiled eggs, bamboo shoots, nori sheets, and chopped green onions.
Pour the hot soup into the bowls and serve immediately with chopsticks and a soup spoon.
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