Step 1

In a large pot, bring 4 quarts water to a boil. Reserve ½ cup of the hot water; set aside. Add the pasta to the pot, then cook, stirring occasionally, until tender.

Step 2

Meanwhile, in a small bowl, whisk together the peanut butter, garlic, vinegar, soy sauce, chili-garlic sauce, miso and ¼ cup of the reserved water.

Step 3

When the pasta is done, drain and return to the pot. Off heat, add the peanut butter mixture and toss until evenly coated. If needed, add more of the reserved water 1 tablespoon at a time to thin the sauce. Stir in the scallions, then taste and season with salt.