Cook pasta in a large pot of boiling water until done. Drain.
Meanwhile, combine oil and onions in a small skillet. Saute over low heat until tender. Add ginger; cook and stir for 1 to 2 minutes.Mix in peanut butter, soy sauce, water, vinegar, sugar, and red pepper flakes. Remove from heat.
Toss noodles with sauce, and serve.
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