Begin by thinly slicing your pork loin, spiralizing the zucchini into noodles, grating the ginger, and slicing the red bell pepper and shiitake mushrooms.
Heat the avocado oil in a large pot over medium-high heat. Add the sliced pork loin and cook until browned. Remove the pork and set aside.
In the same pot, add the grated ginger and minced garlic, sautéing for about a minute until fragrant.
Stir in the red pepper flakes, allowing them to release their heat for about 30 seconds.
Pour in the chicken broth and water, bring to a simmer. Add the coconut aminos, fish sauce, and rice vinegar. Season with salt and pepper to taste.
Incorporate the sliced red bell pepper and shiitake mushrooms into the pot. Let it simmer for about 10 minutes until the vegetables are tender.
Add the browned pork back into the pot, and continue to simmer for an additional 10 minutes, allowing the flavors to meld together.
Just before serving, add the zucchini noodles to the pot, letting them cook for 2-3 minutes until they are soft but still retain some bite.
Ladle the soup into bowls, making sure to distribute the pork, vegetables, and noodles evenly. Garnish with green onions, sesame seeds, and cilantro if desired.