Peanut-Sesame Udon Noodles with Scallions

Natural peanut butter approximates the dark color and rich flavor of Chinese sesame paste, which can be difficult to find. The sauce can be made ahead and refrigerated for up to a week; bring it to room temperature before using. Check the packaging of your noodles for their cooking timing. To round out the dish, add cooked shredded chicken, poached shrimp, cubes of sauteed tofu or edamame.