Vietnamese pho is built on a long-simmered and aromatic stock infused with charred ginger and onion, spices, and fish sauce, ladled over rice noodles and most commonly served with thin slices of beef. This is not that. We borrowed the technique of charring the onion and toasting the spices to give a quick, weeknight-friendly boost to store-bought chicken stock for this pork and noodle soup.