Bring a large pot of water to a boil. Add noodles and cook until barely tender, about 5 minutes. They should retain a hint of chewiness.
Drain noodles, rinse with cold water, drain again and toss with a splash of sesame oil.
In a medium bowl, whisk together the remaining 2 tablespoons sesame oil, the soy sauce, rice vinegar, sesame paste, peanut butter, sugar, ginger, garlic and chile-garlic paste.
Pour the sauce over the noodles and toss.
Transfer to a serving bowl, and garnish with cucumber and peanuts.
