Brown chicken. Salt and pepper the chicken thighs. Prep The Dutchess with a splash of olive oil over medium high heat. Cook skin side down for 8-10 minutes or until the skins release from the pot. Flip and cook for another 3 minutes. Remove chicken from pot onto a plate and set aside to cool slightly. Preheat the oven to 325.
Add aromatics. Add yellow onion, garlic, ginger, and 1 sliced jalapeño to the pot with the brown bits. Deglaze with a splash of mirin. Cook for a few minutes until the vegetables are fragrant and slightly translucent.
Simmer. Add chicken broth. Water and an anchovy “bouillon” cube is a great substitute. Add a splash of soy sauce and fish sauce. Slice the thick white part of the napa cabbage outer leaves and add to the soup. Save the tender, leafy parts to add later.
Prep chicken. While the soup simmers, separate the chicken skins and place on a sheet tray. Shred the rest of the meat by hand or with forks and add it all back into the soup, bones included to add depth to the broth. Cook the chicken skins in the oven for 40 minutes or until crispy. Season with flaky salt.
Make herb oil. In a blender, combine all the herbs and the neutral oil. Blend until well incorporated. Transfer to Saucy and cook on low for 20 minutes. Then, strain into a bowl and cool over an ice bath.
Season. Season the soup with salt, pepper, and a splash of apple cider vinegar to taste. Add in tender leafy napa leaves and scallions. Adjust with more mirin and/or apple cider vinegar as needed.
Finish. Top off the soup with crispy chicken skin, sliced jalapeños, herbs, and sliced perilla leaves on top. Finish with herb oil and enjoy piping hot.