Mona and Carlos Lu stress that you seek out the specified brands of noodles if at all possible. Other pancit Canton noodles, they say, taste medicinal, and other mung bean vermicelli tend to disintegrate when stir-fried.
Place the vermicelli noodles in a large bowl and cover with hot water. Let soak for 30 minutes, then drain.
Meanwhile, to make the chicken stock, place the chicken breast in a large pot and add 8 to 10 cups water (just enough to cover the chicken) and 2 teaspoons salt. Bring the liquid to a boil over high heat, then reduce the heat and simmer until the chicken