Shred off all the chicken/meat off your rotisserie chicken and set the chicken aside
Toast all of your pho spices on a dry skillet
Add your spices into a spice bag or cheesecloth and tie it tightly
In the same skillet, toast your onions and ginger until it gets charred
Toss everything into a pot: chicken carcass and skin, charred onion and ginger, rock sugar, chicken drippings and 4-5 quarts water
Bring to a boil and simmer for at least 30 minutes but no longer than 2 hours
If simmering for more than 30 minutes, remove your spice bag
Remove everything inside the pot: bones, onion, ginger, etc.
Season broth to preference using chicken bouillon, fish sauce, salt, sugar and/or MSG
Cook pho noodles in boiling water for 10 to 45 seconds
Assemble a bowl of pho with noodles, shredded chicken, scallion, cilantro, sliced onions, and black pepper
Ladle hot broth over the bowl
Add sriracha, hoisin sauce, and chili oil to taste
