Slice the reserved beef: Slice as thin as possible (⅙ inch (.1 cm.) is ideal). Place in container and cover with strained broth. (this will keep in moisture and infuse the beef with the broth’s flavor)
Cook the noodles: Soak the rice noodles in room temperature water until softened, about 30 minutes; drain. Cook in rapidly boiling water until tender, rinse with cold water, drain and reserve.