Bring a small pot of water to a boil, carefully lower the egg into the water, and simmer for 6.5 minutes.
Immediately transfer the egg to an ice bath for 5 minutes, then peel and set aside.
Cook the soba noodles in a separate pot of boiling water according to package directions, then drain and rinse with cold water.
In a medium saucepan, heat the sesame oil over medium-high heat and brown the ground pork until cooked through.
Stir in the garlic and ginger, cooking for 1 minute until fragrant.
Pour in the bone broth, tamari, sriracha, and rice vinegar, bringing the mixture to a gentle simmer.
Add the chopped bok choy to the broth and cook for 2 minutes until the greens are wilted but the stems remain crisp.
Divide the noodles into a bowl, pour the pork and broth over them, and top with the halved jammy egg and green onions.