This dish has endless variations: Substitute chicken, pork, or shrimp for the tofu and almost any kind of pasta for the fettuccine. Or add vegetables of your choice.
Combine first 8 ingredients in a small saucepan. Cook over medium heat 5 minutes or until smooth, stirring frequently. Remove from heat.
Cook pasta in boiling water 8 minutes, omitting salt and fat. Add tofu, onions, and carrot; drain. Place pasta mixture in a large bowl. Add peanut butter mixture; toss gently.
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