Step 1: Roast Aromatics : Char onion halves and ginger slices directly over a flame or in a dry skillet until slightly blackened. This brings out the smoky depth in the broth.
Step 2: Simmer the Broth : In a large pot, combine chicken, charred onions, ginger, star anise, cinnamon sticks, cloves, coriander seeds, fish sauce, salt, and sugar. Add 12 cups of water and bring to a boil. Reduce heat and simmer for 45–60 minutes, skimming any foam that rises to the surface.
Step 3: Strain and Shred : Remove the chicken and set aside to cool slightly. Strain the broth through a fine-mesh sieve to remove solids and spices. Shred the chicken into bite-sized pieces, discarding bones and skin if desired.
Step 4: Prepare Noodles : Cook rice noodles according to package instructions. Drain and rinse under cold water to prevent sticking.
Step 5: Assemble the Pho : Divide cooked noodles among bowls. Top with shredded chicken. Ladle hot broth over noodles and chicken.
Step 6: Add Fresh Herbs and Serve : Garnish with bean sprouts, Thai basil, cilantro, green onions, lime wedges, and sliced chilies. Offer hoisin sauce and Sriracha on the side for individual seasoning.