First, start boiling the noodles, until well done, or use 'ready to wok' noodles.
While it's preparing, crush the walnuts with a mortar and pestle.
Heat a skillet on low heat, and add in the veg. oil. After draining the noodles, add the to the skillet. Add the walnuts to the skillet and start mixing it with the noodles.
Add the sesame oil first, then add the peanut butter and start mixing everything around for another 3-5 minutes.
Ready!
As an optional addition, you can fried crunchy onions.