Step 1

Cook spaghetti in a large pot of salted boiling water until al dente. Drain.

Step 2

While noodles are cooking, prepare the sauce. In a small skillet, heat sesame oil over low heat Add the onions (white parts only) and cook until tender. Add the ginger and cook for about 1 minute.

Step 3

Increase the heat to medium and stir in the peanut butter, soy sauce, water, vinegar, sugar, and pepper. Stir until combined. Remove from heat.

Step 4

Toss spaghetti with sauce and garnish with sliced green onions and peanuts if desired.