In a dry sauce pan, heat over medium high heat to quickly sear the spices. When their fragrance start to release, turn off the heat immediately. Then secure them tightly in a sachet.
4 small star anise, 1 small cinnamon stick, 2 whole nutmeg, 5 pieces ginger, 1 tsp coriander seed
Use the same pan to char/sweat an onion. Make sure the onion don't turn completely brown or the chicken pho broth will become very dark like beef pho broth.
1 large white onion
In a large stock pot, bring 7 quart of water to boil, then add the whole chicken, charred onion, and sachet of spices.
7 qt water, 1 whole chicken
Wait until the pot reaches boiling point again then immediately lower the heat and simmer for 45 minutes. Carefully skim away any impurities formed on the surface. Do not stir the pot.
While waiting for chicken to cook, prepare an ice water bath.
When the chicken is fully cooked, carefully remove and submerge it completely in the water bath. Let the chicken stand for 10-15 minutes then remove it from the water.
Pat dry with paper towel. Then pull the chicken meat away from the bones and shred the meat with your fingers.
Discard the white onion and spice sachet. If you don't stir the pot and skim impurities gradually, you don't need to strain (I didn't).
If the broth is too cloudy, you need to carefully strain it through a fine sieve mesh then return the chicken broth back to the pot. Bring the broth back to boiling point.