Cook pasta according to package instructions. Before draining, reserve one cup of the pasta water and set aside.
Combine all ingredients for the peanut sauce. Whisk to fully combine.
After draining pasta, add peanut sauce. Stir into noodles, adding pasta water a little bit at a time until desired consistency is reached. You will most likely only need about 1/4 cup of the pasta water, not all of it.
Serve and garnish with green onions, sesame seeds and crushed peanuts if desired.