"You can judge how good a Pho soup is by how much concentrated flavor is packed in the broth while still retaining a clean, uncloudy, clear broth. There are 2 very important steps to a clear but intense broth – 1) parboiling the chicken to get rid of the impurities 2) charring the ginger and onion for a naturally sweet, robust flavor." This recipe by Nathan Lyon and posted for ZWT6.