Grind peanuts with mortar and pestle.
Grind black sesame seeds.
Cut the bok choy into quarters lengthwise.
Cut the green onion in half separating green part and white parts. Cut the white parts in half lengthwise and keep the green parts for later.
Cut the white parts into julienned strips. Then soak in iced water to remove the bitterness and to make it crisp.
Chop the green parts of green onion into fine rounds.
Bring a pot of water to a boil.
Once boiling, blanch the bok choy first for 2-3 minutes (depending on its size).
Then add the bean sprouts. Cook for 10 seconds and remove both bok choy and bean sprout from the water to drain completely.
Cook the noodles according to the package instructions. I recommend cooking 15-20 seconds less than what package says, as remaining heat will continue to cook the noodles.