Bring a small pot of water to a boil, carefully lower the egg into the water, and cook for 6.5 minutes before transferring to an ice bath.
In a large saucepan over medium-high heat, add the toasted sesame oil and brown the ground pork with the minced ginger, minced garlic, sea salt, and black pepper.
Add the sliced mushrooms to the pork and sauté for 3-4 minutes until they are tender and slightly caramelized.
Pour in the pork broth and bring to a gentle simmer for 5 minutes to allow the savory flavors to meld.
Prepare the rice noodles according to package directions in a separate pot, then drain and divide them into a serving bowl.
Remove the broth from heat, whisk in the white miso paste until fully dissolved, and pour the hot soup over the noodles.
Peel and halve the soft-boiled egg, then garnish the bowl with the egg, sliced green onions, and fresh cilantro.