Lightly salt the chicken thighs with 1 teaspoon of salt. Roast in a 400F degree oven for 20 minutes per side. Remove and set aside.
Heat the fat in the Instant Pot on the saute setting. Add the onions and ginger and let cook for 3-4 minutes without stirring. They should get charred.
Add the cinnamon, coriander, star anise, cloves, peppercorns and green onions. Cook for 2-3 minutes, stirring constantly so the spices don't burn.
Add the water, chicken, fish sauce and palm sugar. Switch the Instant Pot to the pressure setting and cook on high for 20 minutes. Let the pressure release naturally for 5 minutes, then use the manual release.
Strain the broth with a mesh strainer or use cheesecloth and set the chicken aside.
Add the remaining salt to the broth. Add more salt to taste if necessary. Place broth back in Instant Pot to keep hot if necessary.
Cook the rice noodles according to the package. While the noodles cook, shred the chicken into bite size pieces.
Place noodles and chicken in a bowl and pour broth over. Garnish with limes, pickled onions (see below), bean sprouts, herbs, jalapenos, crispy garlic, sriracha and hoisin as desired. Serve hot.
Pickled Red Onions:
Slice onions in ⅛" slices and cover with vinegar. Let sit for 30 minutes, stirring every 10 minutes to ensure onions are covered. Drain the excess vinegar off and serve.
Notes
Roast the chicken thighs in advance for the best flavor. If you choose not to roast them, be sure to remove the skin before adding to the Instant Pot.
You can also use a whole chicken to make this recipe. Use enough water so the chicken is submerged.
This recipe can be made in an 8-quart instant pot as well. Just cover the chicken thighs with water.
Don't stir the onions once you add them. Let them char as it adds flavor to the broth.
Once you add the whole spices, stir regularly to prevent them burning (whole spices will burn quickly and ruin your broth).
Make sure to use whole spices, not ground spices. Ground spices will make it difficult to get a nice clear broth and may affect the flavor.
When servings, the soup is best served with lots of fresh herbs.